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ASME CSD-1 (2009) , Controls and Safety Devices for 
Automatically Fired Boilers as required by the 
States of Colorado, Iowa, Missouri, Nebraska, Nevada, 
et. alia. 



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Controls and 
Safety Devices 
for Automatically 
Fired Boilers 



AN AMERICAN NATIONAL STANDARD 




Copyright © 2009 by the American Society of Mechanical Engineers. /-GjD 

No reproduction may be made of this material without written consent of ASME. ^> 



ASME CSD-1-2009 

(Revision of ASME CSD-1-2006) 



Controls and 
Safety Devices 
for Automatically 
Fired Boilers 



AN AMERICAN NATIONAL STANDARD 



HH 



Mechanical Engineers 



SETTING T H E STA N D A R D 



Copyright © 2009 by the American Society of Mechanical Engineers. r® 



No reproduction may be made of this material without written consent of ASME. ^sl> 



Date of Issuance: May 8, 2009 



The next edition of this Standard is scheduled for publication in 2011. There will be no addenda 
issued to this edition. 

ASME issues written replies to inquiries concerning interpretations of technical aspects of this 
Standard. Interpretations are published on the ASME Web site under the Committee Pages at 
http://cstools.asme.org as they are issued. Interpretations are also included with each edition. 



ASME is the registered trademark of The American Society of Mechanical Engineers. 

This code or standard was developed under procedures accredited as meeting the criteria for American National 
Standards. The Standards Committee that approved the code or standard was balanced to assure that individuals from 
competent and concerned interests have had an opportunity to participate. The proposed code or standard was made 
available for public review and comment that provides an opportunity for additional public input from industry, academia, 
regulatory agencies, and the public-aMarge. 

ASME does not "approve," "rate," or "endorse" any item, construction, proprietary device, or activity. 

ASME does not take any position with respect to the validity of any patent rights asserted in connection with any 
items mentioned in this document, and does not undertake to insure anyone utilizing a standard against liability for 
infringement of any applicable letters patent, nor assume any such liability. Users of a code or standard are expressly 
advised that determination of the validity of any such patent rights, and the risk of infringement of such rights, is 
entirely their own responsibility. 

Participation by federal agency representative(s) or person(s) affiliated with industry is not to be interpreted as 
government or industry endorsement of this code. 

ASME accepts responsibility for only those interpretations of this document issued in accordance with the established 
ASME procedures and policies, which precludes the issuance of interpretations by individuals. 



No part of this document may be reproduced in any form, 

in an electronic retrieval system or otherwise, 

without the prior written permission of the publisher. 



The American Society of Mechanical Engineers 
Three Park Avenue, New York, NY 10016-5990 



Copyright © 2009 by 

THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS 

All rights reserved 

Printed in U.S.A. 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



CONTENTS 



Foreword v 

Committee Roster vi 

Correspondence With the CSDAFB Committee vii 

Summary of Changes viii 

Part CG General 1 

CG-100 General Requirements 1 

CG-200 General Provisions 2 

CG-300 Material Requirements 2 

CG-400 Testing and Maintenance 2 

CG-500 Certification and Reporting 3 

CG-600 Operation 3 

CG-700 Definitions 3 

Part CM Testing and Maintenance 8 

CM-100 Periodic Testing and Maintenance 8 

Part CE Electrical 9 

CE-100 Electrical Requirements 9 

Part CW Steam and Waterside Control 11 

CW-100 Automatic Low- Water Fuel Cutoff and /or Combined 

Water Feeding Device 11 

CW-200 Automatic Fuel Cutoff for Forced Circulation Boilers 13 

CW-300 Pressure Controls 13 

CW-400 Temperature Controls 14 

CW-500 Safety and Safety Relief Valves 14 

CW-600 Modular Boilers 14 

Part CF Combustion Side Control 16 

CF-100 Gas-Fired Boiler Units, Equipment 16 

CF-200 Gas-Fired Boiler Units, Purging 23 

CF-300 Gas-Fired Boiler Units, Safety Controls 23 

CF-400 Oil-Fired Boiler Units, Equipment 24 

CF-500 Oil-Fired Boiler Units, Safety Controls 27 

CF-600 Low Fire Start, Gas- or Oil-Fired Boiler Units 27 

CF-700 Combination Gas- and Oil-Fired Units 27 

CF-800 Electrically Heated Boilers 27 

CF-900 Combustion Side Controls for Modular Boilers 27 

Figure 

1 Sediment Trap 7 

Tables 

CF-1 400,000 Btu/hr (117 228 W) and Smaller (Gas — Natural Draft) 17 

CF-2 400,000 Btu/hr (117 228 W) and Smaller (Power Gas Burners and 

Mechanical Draft Atmospheric Gas Burners), 3 gph (11.4 L/h) and 

Smaller (Oil) 18 

CF-3 Safety Controls for Automatically Fired Units: Power Gas Burners and 

Mechanical Draft Atmospheric Gas Burners 20 

CF-4 Safety Controls for Automatically Fired Units: Atmospheric Gas Burners — 

Natural Draft 21 

CF-5 Safety Controls for Automatically Fired Units: Oil-Fired Burners 26 



Copyright © 2009 by the American Society of Mechanical Engineers. j^L . 

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Nonmandatory Appendices 

A Comparison of This Standard and ANSI Z21.13/CSA 4.9 29 

B Typical Fuel Trains 30 

C Manufacturer's/Installing Contractor's Report for ASME CSD-1 36 

D Recommended Preventive Maintenance Schedule 39 

E References 43 

F Guidance for the Use of U.S. Customary and SI Units in CSD-1 44 

Index 47 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



FOREWORD 



The major perils in operating automatically fired boilers are loss of water (low water), furnace 
explosion, overpressure, and overtemperature. Principal causes of accidents to automatically fired 
boilers are lack of proper controls and safety devices, lack of adequate maintenance, improperly 
trained operators, failure to test controls and safety devices, and complacency on the part of the 
operator due to long periods of trouble-free operation. It is believed that improved instrumenta- 
tion, controls and safety devices, proper operating procedures, and a clearer understanding of 
installation requirements by the manufacturers, installers, and operators can greatly reduce the 
chances of personal injury, damage to property, and loss of equipment from accidents. 

It should be pointed out that any governmental jurisdiction has authority over any particular 
installation. Inquiries dealing with problems of a local character should be directed to the proper 
authorities of such jurisdictions. 

Safety codes and standards are intended to enhance public health and safety Revisions result 
from the committee's consideration of factors such as technological advances, new data, and 
changing environmental and industry needs. Revisions do not imply that previous editions were 
inadequate. 

The first edition of this Standard, which was approved by The American Society of Mechanical 
Engineers' Committee on Controls and Safety Devices for Automatically Fired Boilers, was 
approved and designated as an ASME Standard by The American Society of Mechanical Engineers 
on April 29, 1977. 

The second edition, which was approved by the American National Standards Institute (ANSI) 
on October 4, 1982, was issued on December 31, 1982. An addenda to the edition, CSD-la-1984, 
was approved on August 17, 1984 and issued on November 15, 1984. 

The third edition, which was approved by ANSI on November 17, 1988, was issued on 
February 15, 1989. The CSD-la-1989 Addenda was approved on October 3, 1989 and issued on 
February 15, 1990. The CSD-lb-1990 Addenda was approved on June 21, 1990 and issued on 
December 1, 1990. 

The fourth edition, which was approved by ANSI on February 28, 1992, was issued on June 
15, 1992. The CSD-la-1993 Addenda was approved on August 18, 1993 and issued on November 
30, 1993. The CSD-lb-1994 Addenda was approved on June 20, 1994 and issued on September 

30, 1994. 

The fifth edition, which was approved by ANSI on February 6, 1995, was issued on June 
30, 1995. The CSD-la-1996 Addenda was approved on February 5, 1996 and issued on July 

31, 1996. The CSD-lb-1996 Addenda was approved on July 16, 1996 and issued on December 
20, 1996. 

The sixth edition, which was approved by ANSI on January 30, 1998, was issued on April 14, 
1998. The CSD-la-1999 Addenda was approved on November 2, 1999 and issued on March 
10, 2000. The CSD-lb-2001 Addenda was approved on July 30, 2001 and issued on November 
30, 2001. 

The seventh edition, which was approved by ANSI on January 17, 2002, was issued on April 
15, 2002. 

The eighth edition, which was approved by ANSI on August 9, 2004, was issued on April 
15, 2005. 

The ninth edition, which was approved by ANSI on September 13, 2006, was issued on December 
29, 2006. 

This tenth edition of CSD-1 was approved by ANSI on February 24, 2009. 



(09) 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



COMMITTEE ON CONTROLS AND SAFETY DEVICES FOR 
AUTOMATICALLY FIRED BOILERS 

(The following is the roster of the Committee at the time of approval of this Standard.) 

STANDARDS COMMITTEE OFFICERS 

B. W. Moore, Chair 

P. K. Fanning, Vice Chair 

G. Moino, Secretary 



STANDARDS COMMITTEE PERSONNEL 



R. E. Albert, U.S. Postal Service 

R. D. Austin, State of Colorado, Department of Labor and 

Employment, Division of Oil and Public Safety 
R. K. Black, Johnston Boiler Co. 
R. R. Cate, Zurich 
). P. Chicoine, Mestek, Inc. 
M. H. Diehl, Jr., CNA insurance 

P. K. Fanning, U.S. Naval Facilities Engineering Command 
J. M. Given, Jr., State of North Carolina, Department of Labor 
R. S. Glass, Raypak, Inc. 
L J. Ashton, Alternate, Raypak, Inc. 
J. P. Gorman, CSA International 

G. M. Halley, American Boiler Manufacturers Association 
M. W. Hilton, The Fulton Companies 
D. L. Hunt, St. Paul Travelers 
P. C. Bourgeois, Alternate, St. Paul Travelers 
J. C. Merwin, Potter Electric Signal Co. 
B. L Mickelson, Honeywell International, Inc. 
G. Moino, The American Society of Mechanical Engineers 
M. F. Mooney, State of Massachusetts, Department of Public 

Safety 
B. W. Moore, Hartford Steam Boiler Inspection and Insurance Co. 



V. G. Newton, Chubb and Son 

D. W. Noyes, PB Heat, LLC 

D. A. Scearce, Alternate, PB Heat, LLC 

M. C. Polagye, FM Global 

M. R. Poulin, State of Idaho, Division of Building Safety 

J. Safarz, CEC Combustion Services Group, Inc. 

J. R. Puskar, Alternate, CEC Combustion Services Group, Inc. 

P. H. Schuelke, Weil McLain 

G. Scribner, State of Missouri, Department of Fire Safety 

J. C. Smelcer, Lochinvar Corp. 

J, D. Spulter, ITT Industries, Inc. 

J, C. Stoeger, Industrial Combustion 

M. W. Valentino, Alternate, Industrial Combustion 

F. R. Switzer, Jr., Safe, Inc. 

G. J. Tate, Karl Dungs, Inc. 

K. J. Carlisle, Alternate, Karl Dungs, Inc. 

T. K. Thompson, Underwriters Laboratories, Inc. 

T. F. Hardin, Alternate, Underwriters Laboratories, Inc. 

J. van Heijningen, Siemens Building Technologies, Inc. 

B. Leng, Alternate, Siemens Building Technologies, Inc. 

J. A. Wagner, Fireye, Inc. 

B. Neill, Alternate, Fireye, Inc. 



HONORARY MEMBERS 

T. W. Bukowski, Weber-Stephen Products, Co. 

R. B. West, State of Iowa, Division of Labor Services 



Copyright © 2009 by the American Society of Mechanical Engineers. 
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CORRESPONDENCE WITH THE CSDAFB COMMITTEE 



General. ASME Codes and Standards are developed and maintained with the intent to represent 
the consensus of concerned interests. As such, users of this Standard may interact with the 
Committee by requesting interpretations, proposing revisions, and attending Committee meet- 
ings. Correspondence should be addressed to: 

Secretary, CSDAFB Standards Committee 

The American Society of Mechanical Engineers 

Three Park Avenue 

New York, NY 10016-5990 

Proposing Revisions. Revisions are made periodically to the Standard to incorporate changes 
that appear necessary or desirable, as demonstrated by the experience gained from the application 
of the Standard. Approved revisions will be published periodically. 

The committee welcomes proposals for revisions to this Standard. Such proposals should be 
as specific as possible, citing the paragraph number(s), the proposed wording, and a detailed 
description of the reasons for the proposal, including any pertinent documentation. 

Interpretations. Upon request, the CSDAFB Committee will render an interpretation of any 
requirement of the Standard. Interpretations can only be rendered in response to a written request 
sent to the Secretary of the CSDAFB Standards Committee. 

The request for interpretation should be clear and unambiguous. It is further recommended 
that the inquirer submit his/her request in the following format: 

Subject: Cite the applicable paragraph number(s), and provide a concise description. 

Edition: Cite the applicable edition of the Standard for which the interpretation is 

being requested. 

Question: Phrase the question as a request for an interpretation of a specific requirement 

suitable for general understanding and use, not as a request for approval of 
a proprietary design or situation. The inquirer may also include any plans 
or drawings that are necessary to explain the question; however, they should 
not contain any proprietary names or information. 

Requests that are not in this format will be rewritten in this format by the Committee prior 
to being answered, which may inadvertently change the intent of the original request. 

ASME procedures provide for reconsideration of any interpretation when or if additional 
information that might affect an interpretation is available. Further, persons aggrieved by an 
interpretation may appeal to the cognizant ASME Committee or Subcommittee. ASME does not 
"approve/ 7 "certify/' "rate," or "endorse" any item, construction, proprietary device, or activity. 

Attending Committee Meetings. The CSDAFB Standards Committee regularly holds meetings 
that are open to the public. Persons wishing to attend any meeting should contact the Secretary 
of the CSDAFB Standards Committee. 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 
SUMMARY OF CHANGES 



Following approval by the ASME CSDAFB Standards Committee, and after public review, ASME 
CSD-1-2009 was approved by the American National Standards Institute on February 24, 2009. 

The 2009 edition of ASME CSD-1 includes editorial changes, revisions, and corrections introduced 
in ASME CSD-1-2006, as well as the following changes identified by (09). 



Page 


Location 


Change 


V 


Foreword 


Updated 


1 


CG-110 


Revised 




CG-120 


Revised 




CG-130 


Revised 




CG-140(a)(2) 


Revised 




CG-150 


Added 




CG-160 


Added 


2 


CG-300 


(1) CG-310 revised 

(2) CG-320 deleted 




CG-420 


Revised 


3-7 


CG-510(b) 


Revised 




CG-700 


(1) Section moved from front of book 

(2) Definitions of ANSI and ASME 
deleted 

(3) Term drip leg revised to read drip 

(4) Definitions of ignition system, hot 
surface and valve shaft added 


9 


CE-llO(a) 


Third paragraph revised 


10 


CE-140(a) 


Revised 


12 


CW-140(c) 


Revised 


16, 19 


CF-1 10(a) 


Revised 




CF-1 10(c) 


Revised 



17 



18 



CF-140 



CF-150 



Table CF-1 



Table CF-2 



(1) Subparagraph (a) revised 

(2) Subparagraph (b) added 

(1) Subparagraphs (a) through (d) 
revised in their entirety 

(2) Subparagraphs (e) through (g) added 

(1) Last column added 

(2) Last row added 

(3) General Note added 

(1) Last column added 

(2) Last row added 

(3) General Note added 



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Page 
19 

20 
21 

22 



Location 
CF~160(a) 
CF-162 
Table CF-3 



Table CF-4 



CF-180 



Change 

Last sentence added 

Revised 

(1) Last lines in third entries of second 
and third columns added 

(2) Last entry in second column revised 

(3) General Note revised 

(1) Last lines in third entries of second 
and third columns added 

(2) Last entry in second column revised 

(3) General Note revised 

(1) Subparagraphs (a) through (f) revised 

(2) Subparagraph (g) added 



23 


CF-210(a) 




(1) Revised 

(2) Subparagraph (a)(1) consolidated 
into (a) 

(3) Subparagraph (a)(2) deleted 




CF-310(c) 




Revised 


24,25 


CF-320 




Revised 




CF-330(e) 




Revised 




CF-410 




Revised 


25 


CF-470 




Revised 


26 


Table CF-5 




General Note revised 


27,28 


CF-510(c) 




Revised 




CF-610 




Revised 




CF-710 




Revised 




CF-910 




First sentence revised 




CF-920 




First sentence revised 




CF-930 




Revised 


36 


Manufacturer 's / Installing 
Contractor's Report for 
ASMECSD-1 


"ASME" line revised 


44 


Nonmandatory Appendix F 


Added 


47 


Index 




Updated 



SPECIAL NOTE 

The interpretations to ASME CSD-1 are included in this edition as a separate section for the 
user's convenience. 



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INTENTIONALLY LEFT BLANK 



Copyright © 2009 by the American Society of Mechanical Engineers. 
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ASME CSD-1-2009 



CONTROLS AND SAFETY DEVICES 
FOR AUTOMATICALLY FIRED BOILERS 

Part CG 
General 



CG-100 GENERAL REQUIREMENTS 
(09) CG-110 Scope 

The rules of this Standard cover requirements for the 
assembly, installation, maintenance, and operation of 
controls and safety devices on automatically operated 
boilers directly fired with gas, oil, gas-oil, or electricity, 
subject to the service limitations, exclusions, and accept- 
ance to other listings in CG-120, CG-130, and CG-140, 
respectively. Burner or burner assemblies installed on 
boilers or as a replacement burner shall comply with 
the requirements of CF-110 and CF-410 for gas and oil 
firing, respectively. The use of a gaseous or oil fuel not 
listed in the definitions has not been evaluated, and 
special considerations may be required. 

(09) CG-120 Service Limitations 

The rules of this Standard are applicable to the follow- 
ing service: 

(a) all automatically fired boilers and burner assem- 
blies, regardless of fuel input ratings subject to the exclu- 
sions and acceptance to other listings of CG-130 and 
CG-140, respectively 

(b) burners field-installed in automatically fired 
boilers 

(09) CG-130 Exclusions 

(a) boilers with fuel input ratings greater than or 
equal to 12,500,000 Btu/hr (3 663 389 W), falling within 
the scope of NFPA 85, Boiler and Combustion Systems 
Hazard Code 

(b) water heaters (see CG-700) 

(c) direct gas-fired swimming pool heaters that are 
labeled and listed by a nationally recognized testing 
agency or other organization that is acceptable to the 
authority having jurisdiction as complying with ANSI 
Z21.56/CSA 4.7, Standard for Gas-Fired Pool Heaters 

CG-140 Acceptance by Other Listings 

(a) automatically operated boilers fired with gas 
having inputs of 400,000 Btu/hr (117 228 W) or less that 



(1) comply with Part CW, CE-1 10(a) and (i) 

(2) are labeled and listed by a nationally recognized (09) 
testing agency or other organization that is acceptable 

to the authority having jurisdiction as complying with 
ANSI Z21.13/CSA 4.9, Standard for Gas-Fired Low Pres- 
sure Steam and Hot Water Boilers, and meet the 
remaining requirements of this Standard 

(b) automatically operated boilers fired with oil 
having inputs of 3 gph (11.4 L/h) or less that 

(1) comply with Part CW, CE-1 10(a) and (i) 

(2) are labeled and listed by a nationally recognized 
testing agency or other organization that is acceptable 
to the authority having jurisdiction as complying with 
UL 726, Standard for Oil-Fired Boiler Assemblies, and 
meet the remaining requirements of this Standard 

(c) automatically operated, electrically heated boilers 
having inputs of 115 kW or less that 

(1) comply with Part CW and CE-1 10(a) 

(2) are labeled and listed by a nationally recognized 
testing agency or other organization that is acceptable 
to the authority having jurisdiction as complying with 
UL 834, Standard for Heating, Water Supply, and Power 
Boilers - Electric, and meet the remaining requirements 
of this Standard 

CG-150 Jurisdictional Adoption of CSD-1 (09) 

Adoption of CSD-1 by a jurisdiction shall not preclude 
the jurisdiction adopting and accepting boilers listed or 
certified to other safety standards or codes acceptable 
to the jurisdiction beyond the limitations contained in 
CG-140. Where other such safety codes and /or stan- 
dards are adopted /accepted and overlap with the scope 
of CSD-1, it shall be the responsibility of the jurisdiction 
to define the application of this Standard and those other 
codes and /or standards. 

CG-160 Metric (SI) Units (09) 

This edition of the Standard uses U.S. Customary 
Units. The acceptable equivalent SI units are shown in 
parentheses for information only and have been directly 
(soft) converted from the U.S. Customary Units. 



Copyright © 2009 by the American Society of Mechanical Engineers. 
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ASME CSD-1-2009 



CG-200 GENERAL PROVISIONS 
CG-210 General Provisions 

Installation requirements shall apply to controls, 
safety devices, and burners on automatically fired boil- 
ers covered by this Standard. 

For information regarding boiler and/or burner 
installations, refer to local codes. In the absence of local 
codes, see NFPA 54 /ANSI Z223.1 for gas-fired boilers 
and NFPA 31 for oil-fired boilers. 

For boilers firing liquefied-petroleum gas or LP-gas 
air mixtures, the requirements pertaining to the storage 
container, the first and second stage LP-gas pressure 
regulators, and all components upstream of the point 
of gas delivery (see CG-700) are covered by NFPA 58, 
Liquefied-Petroleum Gas Code. 

CG-220 Installation 

(a) Installation of controls, safety devices, and burners 
shall be in accordance with the manufacturer's instruc- 
tions and the applicable requirements of this Standard. 
Diagrams detailing the wiring and piping connections 
for the controls and safety devices installed shall be 
furnished by the unit manufacturer [see CG-5 10(c)]. 

(b) Installations shall provide accessibility for remov- 
ing burners; adjusting, cleaning, and lubricating work- 
ing parts; and replacing controls, safety devices, and 
other control components. 

(c) For information concerning the location and 
installation of LP-gas air mixture boilers, refer to local 
building codes. 

(d) When one or more modules of a modular boiler 
(see CG-700) are replaced, compatibility of all controls 
and systems shall be ensured. The replacement modules 
shall comply with the initial listing and shall meet the 
requirements of this Standard. 

CG-230 Observation Ports 

Observation ports shall be provided to permit direct 
visual inspection of the pilot, main burner flame, and 
boiler furnace. 

CG-240 Guarding 

Guards shall be provided to protect personnel and 
protect against damage to control equipment. Guarding 
shall conform to applicable regulations. 

CG-250 Annunciator Systems 

Where used, annunciator systems, and their associ- 
ated test and acknowledgement circuits, shall have all 
contacts, switches, relays, and lights arranged so that 
safety control functions are not bypassed. 

CG-260 Combustion Air 

(a) The requirements of combustion air shall be in 
accordance with NFPA 54/ANSI Z223.1, National Fuel 
Gas Code, for gas-fired boilers and with NFPA 31, 



Standard for the Installation of Oil-Burning Equipment, 
for oil-fired boilers. 

(b) Louvers and grilles shall be fixed in the open posi- 
tion or interlocked with the equipment so that they are 
opened automatically during equipment operation. The 
interlock shall be placed on the driven member. 

(c) Fans supplying air to the boiler room for combus- 
tion shall be interlocked with the burner so that air flow 
is proven during equipment operation. 

CG-300 MATERIAL REQUIREMENTS (09) 

CG-310 Components 

Each control and safety device covered by this 
Standard shall be accepted for the intended service by 
a nationally recognized testing agency such as, but not 
limited to, UL, FM, or CSA. 

CG-400 TESTING AND MAINTENANCE 
CG-410 Cleaning 

Manufacturers of controls and safety devices requir- 
ing periodic service shall furnish detailed instructions 
covering the procedures and frequency of cleaning [see 
CG-510(c)]. 

CG-420 Testing (09) 

Manufacturers of boilers and burners covered by this 
Standard shall furnish detailed instructions for testing 
controls and safety devices, both when the boiler is 
operating and when it is out of service [see CG-510(c)]. 

CG-430 Maintenance 

Boiler, boiler unit, and burner manufacturers shall 
furnish detailed instructions on maintenance and service 
procedures for the fuel burning system or electrically 
heated units, including controls and safety devices 
installed with the unit. 

These instructions shall include requirements speci- 
fying that cover plates, enclosures, and guards shall be 
maintained in place at all times, except during mainte- 
nance (see CG-510 and Part CM). 

Boiler, boiler unit, burner, and control manufacturers' 
operation and maintenance instructions furnished with 
the equipment shall be retained and made available to 
the boiler operator (see CG-510). 

CG-440 Operational Testing 

The operation of control systems and safety devices 
installed in accordance with this Standard shall be tested 
by the installing contractor prior to release to the 
owner /user. 

(a) Control systems and safety devices installed in 
accordance with this Standard by the boiler manufac- 
turer on shop-assembled boiler units shall be operation- 
ally tested as close to specified field conditions as 



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ASME C5D-1-2009 



practicable prior to shipment from the manufacturer's 
facility. 

(b) For boiler units with inputs less than or equal to 
400,000 Btu/hr (117 228 W) for gas, or less than or equal 
to 3 gph for oil, where production makes it impractical 
to check each boiler unit individually, the manufacturer 
will prepare and follow an inspection and quality control 
procedure by which the requirements of this paragraph 
will be met. 

CG-500 CERTIFICATION AND REPORTING 
CG-510 Certification and Reporting 

(a) Manufacturers of shop-assembled boiler units cov- 
ered by this Standard shall maintain a report for each 
boiler unit or on each category (type, size, or model) for 
boiler units. For boiler units less than or equal to 400,000 
Btu/hr (117 228 W) for gas, or less than or equal to 3 gph 
for oil, a report shall be maintained on each category 
(type, size, or model). 

This report shall list 

(1) each control and safety device installed in accor- 
dance with this Standard 

(2) name of the manufacturer and model number 
of each control and safety device 

(3) operational test performed (see CG-440) 
CG-510(a)(l) through (3) shall be verified by the signa- 
ture of an authorized representative of the manufacturer 
on this report. An example of an acceptable data report 
form is contained in Nonmandatory Appendix C. 

This report shall be made available to the authorized 
inspection agency or the inspector for action as required 
by the local jurisdiction. 
(09) (b) Installing contractors shall maintain or obtain 
from the manufacturer a report for each installation com- 
pleted. The report shall list 

(1) each control and safety device installed in accor- 
dance with this Standard 

(2) name of the manufacturer and model number 
of each control and safety device 

(3) operational test performed (see CG-440) 
CG-510(b)(l) through (3) shall be verified by the signa- 
ture of an authorized representative of the installing 
contractor on this report. An example of an acceptable 
report form is contained in Nonmandatory Appendix C. 

This report shall be made available to the authorized 
inspection agency or the inspector for action as required 
by the local jurisdiction. 

(c) Installing contractors shall obtain from the boiler 
manufacturer pertinent operating, testing, servicing, 
and cleaning instructions for the controls and safety 
devices (see CG-410, CG-420, and CG-430). It is the 
responsibility of the installing contractor to deliver these 
instructions, together with complete wiring and piping 
diagrams, and a written precaution that the operating, 
testing, and servicing only be performed by a qualified 



individual (see CG-700) to the owner/user and to obtain 
a receipt for the instructions. The receipt shall be filed 
with the installation report. 

CG-600 OPERATION 
CG-610 Lockout 

The manual procedure required for effecting the 
restart of the equipment subsequent to a lockout shall 
be accomplished from a location where the cause of 
the lockout may be determined so that the necessary 
corrective action may be performed to ensure that safe 
operating conditions prevail before restarting the boiler. 

Safety control(s) that can electronically reset without 
local manual intervention, such as when power or con- 
trol input to the device is interrupted and then restored, 
shall not be permitted. 

CG-700 DEFINITIONS 

accepted: a boiler unit, equipment, or device is accepted 
when listed, labeled, or otherwise determined to be suit- 
able and safe by a nationally recognized testing agency. 
Field installations are accepted when approved by the 
authority having jurisdiction. 

air change: the quantity of air necessary to completely 
replace the air contained in the combustion chamber 
and associated flue passages. 

air shutter: an adjustable device for varying the flow 
of air. 

alarm: an audible or visible signal indicating an 
off-standard or abnormal condition. 

alarm circuit: a circuit that includes an alarm. 

annunciator: a device that indicates a condition, either 
normal or abnormal, by visual signals, audible signals, 
or both. 

approved: acceptable to the authority having jurisdiction. 

atomizing media: a supplementary medium, such as 
steam or air, that assists in breaking the fuel oil into a 
fine spray 

authorized inspection agency: the inspection agency 
approved by the appropriate authority of a state or 
municipality of the United States or a province of 
Canada that has adopted this Standard. 

AWG: American Wire Gauge. 

bleed line: a line used to relieve pressure to the atmo- 
sphere, either manually or automatically. 

boiler: a closed vessel in which water is heated, steam 
is generated, steam is superheated, or any combination 
thereof, under pressure or vacuum by the direct applica- 
tion of heat. The term boiler shall include fired units for 
heating or vaporizing liquids other than water where 
these systems are complete within themselves. 



(09) 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



boiler, automatically fired: a boiler that cycles automati- 
cally in response to a control system. 

boiler, high-pressure: a boiler in which steam or vapor is 
generated at a pressure greater than 15 psig 
(103.4 kPa gage). 

boiler, hot-water heating: a boiler in which no steam is 
generated and from which hot water is circulated for 
heating purposes, then returned to the boiler. 

boiler, hot-water supply: a boiler that furnishes hot water 
to be used externally to itself at a pressure less than or 
equal to 160 psig (1 100 kPa gage) or a temperature less 
than or equal to 250°F (120°C) at or near the boiler outlet. 

boiler, low-pressure: a boiler in which steam or vapor is 
generated at a pressure less than or equal to 15 psig 
(103.4 kPa gage). 

boiler, miniature: a boiler that does not exceed any of the 
following limits: 

(a) 16 in. (406.4 mm) inside diameter of shell 

(b) 20 ft 2 (1.86 m 2 ) heating surface 

(c) 5 ft 3 (0.142 m 3 ) gross volume/ exclusive of casing 
and insulation 

(d) 100 psig (689.5 kPa gage) maximum allowable 
working pressure. 

boiler, modular: a steam or hot water heating assembly 
consisting of a grouping of individual boilers called 
modules intended to be installed as a unit with no 
intervening stop valves. Modules may be under one 
jacket or individually jacketed. The individual modules 
shall be limited to a maximum input of 400,000 Btu/hr 
(117 228 W) (gas), 3 gph (11.4 L/h) (oil), or 115 kW 
(electric). 

boiler manufacturer: an organization that manufactures 
pressure parts for boilers or that shop-assembles parts 
into completed boilers. 

boiler system: a system comprised of the boiler (s); its 
controls, safety devices, and interconnected piping; 
vessels; valves; fittings; and pumps. 

boiler unit: a complete assembly comprised of the boiler, 
the apparatus used to produce heat, and associated con- 
trols and safety devices. 

branch circuit: that portion of the wiring system between 
the final overcurrent device protecting the circuit and 
utilization equipment. 

Btu (British thermal unit): a quantity of heat required 
to raise the temperature of 1 lb (0.45 kg) of water 1°F 
(0.56°C). 



1 The gross volume is intended to include such gas passages as 
are integral with the assembled pressure parts. Gross volume is 
defined as the volume of a rectangular or cylindrical enclosure into 
which all the pressure parts of the boiler in their final assembled 
positions could be fitted. Projecting nozzles or fittings need not 
be considered in the volume. 



Btu/hr: a unit of power equal to one British thermal 
unit/hr. 

building code: an ordinance that sets forth requirements 
for building design and construction, and equipment 
installation, or, where such an ordinance has not been 
enacted, one of the following model codes: 

(a) National Building Code 

(b) Standard Building Code 

(c) Uniform Building Code 

burner: a device for the introduction of fuel and air into 
the combustion zone at the desired velocities, 
turbulence, and concentration to establish and maintain 
ignition and combustion of the fuel (see also burner 
assembly). 

burner, atmospheric: a gas burner in which air for combus- 
tion is supplied by natural draft, the inspirating force 
being created by gas velocity through the orifices. 

burner, mechanical draft, atmospheric: an atmospheric gas 
burner including a mechanical draft device, such as a 
forced draft or induced draft fan to provide sufficient 
air for completing the combustion process. 

burner, natural draft type: a burner that depends primarily 
on the natural draft created in the flue to induce the air 
required for combustion into the burner. 

burner, power: a burner in which all air for combustion 
is supplied by a power-driven fan that overcomes the 
resistance through the burner. 

burner assembly: a burner that is factory-built as a single 
assembly or as two or more subassemblies that include 
all essential parts necessary for its normal function when 
installed as intended. 

combined feeder /cutoff: a device that regulates makeup 
water to a boiler in combination with a low-water fuel 
cutoff. 

combustion: the rapid oxidation of fuel, producing heat 
or heat and light. 

combustion air: the air required for combustion of the 
fuel. This does not include the air used for atomization. 

conductor: a body that may be used to conduct electric 
current. 

continuous duty: the design feature of an electrical device, 
such as a motor, enabling the device to operate at the 
rated load for an indefinite period. 

control: a device designated to regulate the fuel, air, 
water, steam, or electrical supply to the controlled equip- 
ment. It may be automatic, semiautomatic, or manual. 

control, operating: an automatic control, other than a 
safety control, to start or regulate input according to 
demand and to stop or regulate input on satisfaction of 
demand. 

control, primary safety: a control directly responsive to 
flame properties, sensing the presence of flame and, ' 



m 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



event of ignition failure or loss of flame, causing safety 
shutdown. 

control safety (also known as limit): a control responsive 
to changes in liquid level, pressure, or temperature and 
set beyond the operating range to prevent the operation 
beyond designed limits. 

control manufacturer: an organization that manufactures 
operating and safety controls for use on boilers. 

CSA: CSA International. 

damper: a valve or plate for regulating combustion air 
or flue gases. 

draft: the difference in pressure between atmospheric 
and some other pressure in the furnace or gas passages. 

draft, mechanical: the draft caused by a mechanical device, 
such as a forced draft or induced draft fan. 

draft, natural: the draft caused by the difference in the 
temperature of the hot flue gases and the outside 
atmosphere. 

drip: the container placed at a low point in a system of 
piping to collect condensate and from which condensate 
may be removed. 

fan, forced draft: a fan used to supply air, under pressure, 
to the fuel-burning equipment of the boiler. 

fan, induced draft: a fan used to exhaust gases, under 
suction, from the boiler. 

firing rate: the rate at which air, fuel, or an air-fuel mixture 
is supplied to a burner, expressed in volume or heat 
units supplied per unit of time. 

flame failure response time: the time interval between the 
loss of flame and deenergizing the safety shutoff valve. 

FM: Factory Mutual system. 

fuel train: a series of valves, regulators, and controls, 
between the burner and the source of fuel, that regulates 
and controls the flow of fuel to the burner. 

gas: one of the following fuel gases: natural gas, liquefied 
petroleum (LP) gas, LP-air mixture, manufactured gas, 
or mixed gas. 

gas-pressure regulator, main: a device for controlling and 
maintaining a predetermined gas pressure for the main 
burner. 

gas-pressure regulator, pilot: a device for controlling and 
maintaining a predetermined gas pressure for the pilot 
burner. 

ground: a conducting connection, whether intentional or 
accidental, between an electrical circuit or equipment 
and either the earth or a conducting body that serves 
in place of the earth. 

grounded: connected to earth or to some conducting body 
that serves in place of the earth. 

grounded conductor: a system or circuit conductor that is 
intentionally grounded. 



grounding conductor, equipment: the conductor used to 
connect noncurrent-carrying metal parts of equipment, 
raceways, and other enclosures to the system-grounded 
conductor at the service and /or the grounding electrode 
conductor. 

guarded: covered, shielded, fenced, enclosed, or other- 
wise protected by means of covers, casings, barriers, 
rails, screens, mats, or platforms to prevent contact by 
persons or objects. 

high fire: the rate of a burner at or near design maximum 
fuel input. 

ignition system, direct: an automatic ignition system that 
uses an electrically energized device to ignite fuel at a 
main burner. 

ignition system., hot surface: an automatic, direct ignition 
system that uses a hot surface igniter to ignite fuel at a 
main burner. 

input rating: the fuel-burning capacity of a burner at sea 
level in Btu/hr (W) as specified by the manufacturer. 

installing contractor: an organization that installs a boiler, 
combustion controls, burners, and protective equipment 
in the field. 

labeled: equipment or materials to which has been 
attached a label of a nationally recognized testing agency 
that maintains periodic inspection of production of 
labeled equipment or materials. Labeling indicates com- 
pliance with nationally recognized standards. 

liquefied-petroleum gas: fuel gases, including commercial 
propane; predominantly propane, propylene, or com- 
mercial butane; predominantly butane; isobutane; 
and /or butylene. 

listed: equipment or materials included in a list pub- 
lished by a nationally recognized testing agency that 
maintains periodic inspection of production of listed 
equipment or materials. Listing indicates compliance 
with nationally recognized standards. 

local: within physical sight and sound of the affected 
equipment (see also lockout). 

lockout: a safety shutdown that requires a local, manual 
procedure to restart the equipment (see also shutdown, 
safety). 

low fire start: the lightoff ignition of a burner with the 
fuel controls in a low fire position. In a system with 
guaranteed low fire start, interlocks are used to prevent 
startup if the burner is not in the low fire position. 

low-water fuel cutoff: a device that shuts off the fuel when 
the boiler water falls to an unsafe level. 

LP-gas air mixture: liquefied-petroleum gases distributed 
at relatively low pressures and normal atmospheric tem- 
peratures that have been diluted with air to produce a 
desired heating value and utilization characteristic. 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



main burner flame-establishing period: the interval of time 
the main burner fuel safety shutoff valves are permitted 
to be open before the primary safety control is required 
to prove the presence of the main burner flame. 

main manifold gas pressure: the gas pressure measured at 
a location that is specified by the burner/boiler unit 
manufacturer and is taken downstream of the main gas 
pressure regulator. 

manifold, gas: the conduit of an appliance that supplies 
gas to the individual burners. 

manual reset device: a. component of a control that requires 
resetting by hand to restart the burner after safe 
operating conditions have been restored. 

maximum fixed stop limit: on a temperature or pressure 
control having an adjustable set point, the maximum 
fixed stop limit is the maximum setting to which the 
control can be adjusted and still perform its intended 
function (i.e., safety shutdown) but not be exceeded due 
to a mechanical or electrical stop device. 

NEMA: National Electric Manufacturers Association. 

NFPA: National Fire Protection Association. 

oil: any commercial grade fuel oil as defined by 
ASTM D 396. 

pilot: a small burner that is used to lightoff (ignite) the 
main burner. 

pilot, continuous: also known as a constant burning pilot, 
a pilot that burns without turndown throughout the 
entire time the burner assembly is in service, whether 
the main burner is firing or not. 

pilot, intermittent: a pilot that is automatically lighted 
each time there is a call for heat. It burns during the 
entire period the main burner is firing. 

pilot, interrupted: a pilot that is automatically lighted 
each time there is a call for heat. The pilot fuel is cut 
off automatically at the end of the main burner flame- 
establishing period. 

pilot, proved: a pilot flame supervised by a primary safety 
control. 

pilot flame-establishing period: the interval of time that fuel 
is permitted to be delivered to a pilot burner before the 
primary safety control is required to prove the pilot 
flame. 

pilot manifold gas pressure: the gas pressure measured at 
a location that is specified by the burner/boiler unit 
manufacturer and is taken downstream of the pilot 
gas-pressure regulator. 

point of gas delivery: for other than undiluted liquefied- 
petroleum gas systems, the point of gas delivery shall 
be considered the outlet of the service meter assembly 
or the outlet of the service regulator or service shutoff 
valve when no meter is provided. For undiluted, lique- 
fied-petroleum gas systems, the point of gas delivery 



shall be considered the outlet of the first stage 
LP-gas-pressure regulator. 

pool heater: an appliance designed for heating nonpotable 
water stored at atmospheric pressure, such as water in 
swimming pools, spas, hot tubs, and similar 
applications. 

postpurge period: a period of time after the fuel valves 
close, during which the burner motor or fan continues 
to run to supply air to the combustion chamber. 

prepurge period: a period of time on each startup during 
which air is introduced into the combustion chamber 
and associated flue passages in volume and manner as to 
completely replace the air or fuel-air mixture contained 
therein prior to initiating ignition. 

pressure regulator, LP-gas, first stage: on undiluted LP- gas 
systems, a pressure regulator designed to reduce pres- 
sure from the container to 10.0 psi (69 kPa) or less. 

pressure regulator, LP-gas, second stage: a pressure regula- 
tor for service on undiluted LP-gas systems designed 
to reduce first stage regulator outlet pressure to 14.0 in. 
W.C. (4.0 kPa) or less. 

pressure regulator, service: a pressure regulator installed 
by the serving gas supplier to reduce and limit the ser- 
vice line gas pressure to delivery pressure. 

proven prepurge: a provision of the control system for 
preventing burner operation until prescribed air flow is 
proven to be established during prepurge. 

qualified individual: a boiler service technician who is 
engaged in and responsible for installation, replacement, 
repair, or service of the boiler, fuel-burning system con- 
trols, and safety devices and is experienced in such work. 

readily accessible: having direct unimpeded access with- 
out the need of a ladder or removing or moving any 
panel, door, or similar covering of the item described. 

recycle: the process of sequencing a normal burner start 
following safety shutdown before the establishment of 
lockout. 

relay: a device that is operative by a variation in the 
conditions of one electric circuit to start the operation 
of other devices in the same or another electric circuit, 
such as pressure or temperature relay. 

relight: the action upon loss of main flame to reestablish 
the ignition source without recycle. 

sediment trap: a device in a gas line that collects and 
prevents solid debris (such as pipe dope, slag, dirt, etc.) 
from traveling downstream into the gas controls (see 
Fig. 1). 

shutdown, normal: shutting off fuel and ignition energy 
to the burner by means of an operating control. 

shutdown, safety: shutting off all fuel and ignition energy 
to the burner by means of a safety control or primary 
safety control (see also lockout). 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



Fig. 1 Sediment Trap 

Gas supply inlet 



Tee fitting ► 



To gas 
■"" control(s) 
inlet 



1 


3 in. (76 mm) 
min. 

1 





Nipple 



J-< Cap 



switch, air flow: a device used to prove the flow of air. 

switch, high oil temperature: a temperature-actuated 
device arranged to stop the flow of fuel to a preheated 
oil burner or to prevent it from starting when the fuel 
oil temperature rises above a set point, which shall be 
the upper end of the viscosity range recommended by 
the burner manufacturer. 

switch, high-pressure: a pressure- actuated device to moni- 
tor liquid, steam, or gas pressure and arranged to stop 
the flow of fuel to the burner at a preset high pressure. 

switch, low oil temperature: a temperature-actuated device 
arranged to stop the flow of fuel to a preheated oil 
burner or to prevent it from starting when the fuel oil 
temperature falls below a set point, which shall be the 
lower end of the viscosity range recommended by the 
burner manufacturer. 

switch, low-pressure: a pressure-actuated device to moni- 
tor liquid, steam, or gas pressure and arranged to stop 
the flow of fluid to the burner at a preset low pressure. 

switch, pressure: a pressure- responsive device that makes 
or breaks an electrical circuit and may be automatically 
or manually reset. 

time delay: a deliberate delay of a predetermined time 
in the action of a safety device or control. 



UL: Underwriters Laboratories, Inc. 

upper set point limit: on a temperature or pressure control 
having an adjustable range of set points, the upper set 
point limit is the maximum pressure or temperature set 
point in the range of the control, to which the control 
can be adjusted and still perform its intended function 
(i.e., safety shutdown). 

valve, automatic: an automatic device consisting essen- 
tially of a valve and operator that controls the fuel supply 
to the burner(s) during normal operation of a boiler. It 
may be actuated by application of electrical, mechanical, 
or other means. 

valve, lubricated plug type: a valve of the plug and barrel 
type designed for maintaining a lubricant between the 
bearing surfaces. 

valve, modulating control: a valve designed to regulate 
fuel input to the burner in response to demand. 

valve, proof of closure: a safety shutoff valve equipped 
with an interlock switch that will be actuated only after 
the valve has fully closed. 

valve, safety shutoff: a fast-closing valve that automatically 
and completely shuts off the fuel supply in response to 
a normal or safety shutdown signal. 

valve shaft: the movable part of the sealing mechanism 
of a safety shutoff valve. The valve shaft may also be 
referred to as the valve stem. 

vent limiter: a means that limits the flow of gas from the 
atmospheric diaphragm chamber to the atmosphere in 
the event of diaphragm rupture. This may be either a 
limiting orifice or device. 

vent line: a line used to convey leakage gases to a safe 
point of discharge. 

vent valve: a normally open, power-closed valve piped 
between the two safety shutoff valves and vented to a 
safe point of discharge. 

water heater: a vessel, which is closed except for openings 
through which water can flow, that includes the appara- 
tus by which heat is generated and on which all controls 
and safety devices necessary to prevent pressures greater 
than 160 psig (1 100 kPa gage) and water temperatures 
greater than 210°F (99°C) are provided, in which potable 
water is heated by the combustion of fuels, electricity, 
or any other heat source and withdrawn for external use. 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



Part CM 
Testing and Maintenance 



CM-100 PERIODIC TESTING AND MAINTENANCE 

CM-110 General 

Since the effective operation of all safety devices 
depends upon their ability to respond to their activating 
impulses, a systematic and thorough maintenance pro- 
gram shall be established and performed. 

(a) An inspection and maintenance schedule shall be 
established and performed on a periodic basis. The peri- 
odic basis shall be at least that required by the equipment 
manufacturer. 

(b) Operability and set points on all devices, where 
applicable, shall be verified by periodic testing, and the 
results shall be recorded in the boiler log, maintenance 
record, service invoice, or other written record. 

(c) Any defects found shall be brought to the attention 
of the boiler owner and shall be corrected immediately. 

id) Frequent inspection, adjustment, and cleaning 
shall be performed during initial start-up operation to 
ensure all safety controls and devices are functioning as 
intended and are in a reliable operating condition (see 
CM-120). 



CM-120 Familiarity With Equipment and Procedures 

The qualified individual performing inspections and 
tests shall be trained and familiar with all operating 
procedures and equipment functions and shall be capa- 
ble of determining the equipment is in an as-designed 
operating condition. The individual shall be familiar 
with all precautions and shall have complied with the 
requirements of the authority having jurisdiction. 

CM-130 Periodic Maintenance and Testing 

The owner or user of an automatic boiler system shall 
develop and maintain a formal system of periodic pre- 
ventive maintenance and testing. Tests shall be con- 
ducted on a regular basis, and the results shall be 
recorded in the boiler log or in the maintenance record 
or service invoice. The manufacturer's instructions shall 
be followed. Additional information is contained in a 
recommended checklist found in Nonmandatory 
Appendix D. 

Because of the variety of equipment and modes of 
operation, owners and users shall provide a detailed 
checklist for operator's use in accordance with the boiler, 
boiler unit, burner, and control device assembly manu- 
facturer's instructions. 



C 



Copyright © 2009 by the American Society of Mechanical Engineers, 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



Part CE 
Electrical 



CE-100 ELECTRICAL REQUIREMENTS 

CE-110 General 

Installation requirements shall apply to controls, 
safety devices, and burners on automatically fired boil- 
ers covered by this Standard. 

For information regarding boiler and/or burner 
installations, refer to local codes. In the absence of local 
codes, see NFPA 70, National Electrical Code. 
(09) (a) A disconnecting means capable of being locked 
in the open position shall be installed at an accessible 
location at the boiler so that the boiler can be discon- 
nected from all sources of potential. This disconnecting 
means shall be an integral part of the boiler or adjacent 
to it. 

A manually operated remote shutdown switch or cir- 
cuit breaker shall be located just outside the boiler room 
door and marked for easy identification. Consideration 
should be given to the type and location of the switch 
to safeguard against tampering. If the boiler room door 
is on the building exterior, the switch should be located 
just inside the door. If there is more than one door to 
the boiler room, there should be a switch located at 
each door. 

Activation of the emergency shutdown switch or cir- 
cuit breaker shall immediately shut off the fuel or energy 
supply. 

(b) All uninsulated live metal parts and all rotating 
or moving parts that may cause injury shall be guarded 
to avoid accidental contact. 

(c) The electrical equipment shall be arranged so that 
failure of this equipment will cause the fuel supply to 
be shut off. 

(d) The power supply to the electrical control system 
shall be from a two-wire branch circuit that has a 
grounded conductor; otherwise, an isolation trans- 
former with a two-wire secondary shall be provided. 
When an isolation transformer is provided, one side 
of the secondary winding shall be grounded. Control 
voltage shall not exceed 150 nominal volts, line to line. 

(1) One side of all coils shall be electrically located 
in the grounded side of the circuit. All switches, contacts, 
and overcurrent devices shall be electrically located in 
the ungrounded or "hot" side of the circuit. 

(2) All electrical contacts of every safety device 
installed in the same control circuit shall be electrically 
connected in series. 



(e) All electrical components and devices shall have 
a voltage rating commensurate with the supply voltage 
of the control system. 

(f) All electrical components and devices shall be pro- 
vided with an electrical enclosure that is at least NEMA 
Type 1 (General Purpose). Where electrical devices will 
be subject to dripping moisture, the enclosures shall be 
at least NEMA Type 2 (Driptight). 

(g) All electrical control devices shall be of a type 
tested and accepted by a nationally recognized testing 
agency. 

(h) The design of the control circuits shall be such 
that limit and primary safety controls shall directly open 
a circuit that functions to interrupt the supply of fuel 
to combustion units. 

(i) Automatic resetting devices, controls, or switches 
shall be installed in accordance with the instructions 
of the combustion safeguard control manufacturer. No 
automatic resetting device, control, or switch shall be 
installed in the wiring between the load side (terminal) 
of the primary or programming control and the main 
or ignition fuel valve or valves. This does not preclude 
the installation of manually operated test switches for 
the purposes of testing tight closure of individual fuel 
valves. 

CE-120 Overcurrent Protection 

(a) Conductors for interconnecting wiring that is 
smaller than the supply conductors shall be provided 
with overcurrent protection based on the size of the 
smallest interconnecting conductors external to any con- 
trol box. 

(b) Overcurrent protection for interconnecting wiring 
shall be located at the point where the smaller conduc- 
tors connect to the larger conductors. However, overall 
overcurrent protection is acceptable if it is sized on the 
basis of the smallest conductors of the interconnecting 
wiring. 

(c) Overcurrent protection devices shall be accessible, 
and their function shall be identified. 

CE-130 Motors 

(a) Motors exposed to dripping or spraying oil or 
water shall be of drip-proof construction. All motors 
shall be fully guarded as installed. 

(b) Motors shall be provided with a corrosion- 
resistant nameplate. 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



(09) 



(c) Motors shall be provided with running protection 
by means of integral thermal protection, overcurrent 
devices, or a combination of both in accordance with 
manufacturer's instructions that shall be based on the 
requirements of NFPA 70, National Electrical Code. 

(d) Motors shall be rated for continuous duty and 
shall be designed for an ambient temperature of 104°F 
(40°C) or higher. 

(e) All motors shall be provided with terminal leads 
or terminal screws in terminal boxes integral with, or 
secured to, the motor frames. 

CE-140 Ignition System 

(a) When automatic electric ignition is provided, it 
shall be accomplished by means of a high-voltage elec- 
tric spark, a high-energy electric spark, or a hot surface 
igniter. 

(b) Ignition transformers shall conform to require- 
ments of UL 506, Standard for Specialty Transformers. 

(c) Ignition cable shall conform to the requirements 
of UL 814, Gas-Tube-Sign Cable. 

CE-150 Wiring 

(a) All wiring for boilers shall be rated for the maxi- 
mum operating temperature to which it may be exposed. 



Such wiring shall be in accordance with NFPA 70, 
National Electrical Code. All wiring between compo- 
nents shall have copper conductors not less than size No. 
18 AWG and constructed in accordance with NFPA 70, 
National Electrical Code. 

(b) All electrical wiring shall have a voltage rating 
commensurate with the voltage of the power supply 

(c) Conductors shall be protected from physical 
damage. 

(d) Conductors shall be sized on the basis of the rated 
current of the load they supply. 

CE-160 Bonding and Grounding 

(a) Means shall be provided for grounding the major 
metallic frame or assembly of the boiler. 

(b) Noncurrent-carrying enclosures, frames, and simi- 
lar parts of all electrical components and devices shall 
be bonded to the main frame or assembly of the boiler. 
Electrical components that are bonded by their installa- 
tion do not require a separate bonding conductor. 

(c) When an insulated conductor is used to bond elec- 
trical components and devices, it shall show a continu- 
ous green color, with or without a yellow stripe. 



10 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



Part CW 
Steam and Waterside Control 



CW-100 AUTOMATIC LOW-WATER FUEL CUTOFF 
AND/OR COMBINED WATER FEEDING 
DEVICE 

CW-110 General Requirements for Water Level 
Controls for All Boilers 

(a) Each low -water fuel cutoff or combined feeder/ 
cut-off device shall conform to UL 353, Standard for 
Limit Controls, and shall be accepted by a nationally 
recognized testing agency. 

(b) Installation diagrams and instructions shall be fur- 
nished by the manufacturer. 

(c) Low- water fuel cutoffs or combined feeder /cut-off 
devices shall be located to provide access for servicing, 
repairing, testing, and inspection. 

(d) The low-water fuel cutoff shall have a pressure 
rating at least equal to the maximum allowable working 
pressure of the boiler. 

(e) In probe-type, low-water fuel cutoffs, an open cir- 
cuit failure, break, or disconnection of the electrical com- 
ponents or conductors in the safety circuit shall prevent 
continued operation of the firing mechanism. 

(f) Alarms, when used, shall be distinctly audible 
above the ambient noise level and may be used in con- 
junction with indicating lights. They shall be located to 
alert the operator or an individual trained as to what 
action to take when an alarm indicates a potentially 
dangerous situation is developing. 

(g) Low-water fuel cutoffs of the automatic or manual 
reset type shall be electrically connected in accordance 
with CE-llO(i). 

CW-120 Requirements for Water Level Controls for 
Low-Pressure Steam or Vapor System 
Boilers 

(a) Each automatically fired, low-pressure steam or 
vapor system boiler shall have at least two automatic 
low-water fuel cutoffs, one of which may be a combined 
feeder /cut-off device. When installed external to the 
boiler, each device shall be installed in individual cham- 
bers (water columns), which shall be attached to the 
boiler by separate pipe connections below the waterline. 
A common steam connection is permissible. Each cut- 
off device shall be installed to prevent startup and to 
cut off the boiler fuel or energy supply automatically, 
prior to the fall of the surface of the water below the 
level of the lowest visible part of the gage glass (see also 
CW-210). 



EXCEPTION: Only one low-water cutoff is required on gravity 
return units installed in residences, as defined by the authority 
having jurisdiction. 

A water feeding device, when used, shall be con- 
structed and installed so that the water inlet valve cannot 
feed water into the boiler through the float chamber or 
its connections to the boiler. The water feeding device 
shall be located to maintain the operating water level. 

(b) The electrical circuit shall be connected in such a 
manner that either low-water fuel cut-off control will 
shut off the fuel or energy supply to the boiler when a 
low-water condition develops. One cut-off control shall 
be set to function ahead of the other. 

(1) With a pumped condensate return, functioning 
of the lower of the two cut-off controls shall cause safety 
shutdown and lockout. The manual reset may be incor- 
porated in the lower cut-off control. Where a reset device 
is separate from the low-water fuel cutoff, a means shall 
be provided to indicate actuation of the low-water fuel 
cutoff. The manual reset device may be the instanta- 
neous type or may include a time delay of not more 
than 3 min after the fuel has been cut off. 

(2) With gravity condensate return, the lower of the 
two cut-off controls shall be electrically connected with 
the upper cutoff to cause a safety shutdown requiring 
manual reset only when the upper cutoff has failed to 
function. 

(c) The fuel cut-off device may be inserted internally 
or attached externally to the boiler. An external cut-off 
device may be attached to piping connecting a water 
column to the boiler or combined with a water column. 
Water column piping and connections shall be at least 
NPS 1. If the lower water fuel cutoff is connected to the 
boiler by pipe or fittings, no shutoff valves of any type 
shall be placed in such piping. A cross, or equivalent 
fitting, shall be placed in the water piping connection 
at every right angle to facilitate cleaning and inspection. 
Fuel cut-off devices embodying a separate chamber shall 
have a vertical drainpipe and blowoff valve, not less 
than NPS \, located at the lowest point of the chamber 
or water-equalizing pipe connections so that the cham- 
ber and equalizing pipe can be flushed and the device 
tested. 

(d) A low-water fuel cutoff or combined feeder/cut- 
off device may also be installed in the tapped openings 
available for attaching a water gage glass directly to a 
boiler, provided the connections are made to the boiler 
with nonferrous tees or wyes not less than NPS V 2 



11 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



between the boiler and water gage glass so that the 
water gage glass is attached directly and as close as 
possible to the boiler; the run of the tee or wye shall 
take the water glass fitting, and the side outlet or branch 
of the tee or wye shall take the low-water fuel cutoff or 
combined feeder/ cut-off device. The ends of all nipples 
shall be hollowed to full-size diameter. 

(e) A system may incorporate a time delay component 
with the low-water fuel cut-off device to prevent short 
cycling. This component shall not constrict any connect- 
ing piping, and the time delay shall not exceed the boiler 
manufacturer's recommended timing or 90 sec, which- 
ever is less. The device shall cut off the fuel or energy 
supply when the water falls to the lowest visible part 
of the gage glass. 

CW-130 Requirements for Water Level Controls for 
Hot-Water Heating Boilers 

(a) Each automatically fired, hot-water heating boiler, 
except those installed in residences (as defined by the 
authority having jurisdiction), shall be protected by a 
low-water fuel cutoff intended for hot-water service (see 
also CW-210). 

(b) Since there is no normal waterline to be main- 
tained in a hot- water boiler, the low- water fuel cutoff 
can be located any place above the lowest safe permissi- 
ble water level established by the boiler manufacturer. 

(c) If the low- water fuel cutoff is located in the system 
piping, it must be ensured that the float chamber will 
drain properly under a low-water condition, and the 
installation must be arranged to ensure that if flow 
occurs in the float chamber, it will be in the upward 
direction. The low-water fuel cut-off device may be 
inserted internally or attached externally to the boiler. 
An external low- water fuel cut-off device attached to 
the boiler by piping and connections shall be at least 
NPS 1. If the low-water fuel cutoff is connected to the 
boiler by pipe or fittings, no shutoff valves of any type 
shall be placed in such piping. A cross, or equivalent 
fitting, shall be placed in the water piping connection 
at every right angle to facilitate cleaning and inspection. 
Low-water fuel cut-off devices embodying a separate 
chamber shall have a vertical drainpipe and a blow-off 
valve not less than NPS \, located at the lowest point 
of the chamber of water equalizing pipe connections so 
that the chamber and equalizing pipe can be flushed 
and the device tested. 

(d) Functioning of the low-water fuel cutoff due to a 
low-water condition shall cause safety shutdown and 
lockout. Where a reset device is separate from the 
low- water fuel cutoff, a means shall be provided to indi- 
cate actuation of the low-water fuel cutoff. The manual 
reset device may be the instantaneous type or may 
include a time delay of not more than 3 min after the 
fuel has been cut off. 



(e) A means shall be provided for testing the opera- 
tion of the low-water fuel cutoff without resorting to 
draining the entire system. Such means shall not render 
the device inoperable. If the means temporarily isolates 
the device from the boiler during this testing, it shall 
automatically return to its normal position. 

CW-140 Requirements for Water Level Controls for 
High-Pressure Steam Boilers 

(a) Each automatically fired, high-pressure steam 
boiler, except miniature boilers, shall have at least two 
automatic low- water fuel cut-off devices. When installed 
external to the boiler, each device shall be installed in 
individual chambers (water columns), which shall be 
attached to the boiler by separate pipe connections 
below the waterline. A common steam connection is 
permissible. Each cut-off device shall be installed to pre- 
vent startup and cut off the boiler fuel or energy supply 
automatically when the surface of the water falls to a 
level not lower than the lowest visible part of the gage 
glass. One control shall be set to function ahead of the 
other. Each miniature boiler shall have at least one low- 
water fuel cut-off device (see also CW-210). 

(b) Functioning of the lower of the two controls shall 
cause safety shutdown and lockout. The manual reset 
may be incorporated in the lower cut-off control. Where 
a reset device is separate from the low-water fuel cutoff, 
a means shall be provided to indicate actuation of the 
low-water fuel cutoff. The manual reset device may be 
of the instantaneous type or may include a time delay 
of not more than 3 min after the fuel has been cut off. 

(c) The fuel cut-off device may be inserted internally (09) 
or attached externally to the boiler. An external cut-off 
device may be attached on piping connecting a water 
column to the boiler or combined with a water column. 
Water column piping and connections shall be at least 
NPS 1. If the low-water fuel cutoff is connected to the 
boiler by pipe or fittings, no shutoff valves of any type 
shall be placed in such piping. The steam and water 
connections to a water column shall be readily accessible 

for internal inspection and cleaning. Some acceptable 
methods of meeting this requirement are by providing 
a cross- fitting with a back outlet at each right-angle turn 
to permit inspection and cleaning in both directions or 
by using pipe bends or fittings of a type that does not 
leave an internal shoulder or pocket in the pipe connec- 
tion and with a radius of curvature that will permit the 
passage of a rotary cleaner. Fuel cut-off devices embody- 
ing a separate chamber shall have a vertical drainpipe 
and blowoff valve, not less than NPS %, located at the 
lowest point of the chamber or water-equalizing pipe 
connections, so that the chamber and the equalizing pipe 
can be flushed and the device tested. 

(d) A system may incorporate a time delay compo- 
nent with the low-water fuel cut-off device to prevent 
short cycling. This component shall not constrict any 



12 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



connecting piping, and the time delay shall not exceed 
the boiler manufacturer's recommended timing, or 90 
sec, whichever is less. The device shall cut off the fuel 
or energy supply when the water falls to the lowest 
visible part of the gage glass. 

CW-150 Requirements for Operating and Safety 
Controls for Electrically Heated Boilers 

Electric resistance and electrode boilers shall have a 
boiler feed control system that shall maintain the 
operating level in steam boilers and operating water 
pressure on hot- water boilers. Where uncovering of the 
electrical element can lead to an unsafe condition, the 
boiler shall be provided with low- water fuel cutoff (s) in 
accordance with Part CW. Boiler feed control and low- 
water fuel cutoff may be common to one control. In the 
case of electrode-type boilers, where the reduction in 
water level provides a self-limiting control on input, 
low- water fuel cut-off controls are not required. 

CW-200 AUTOMATIC FUEL CUTOFF FOR FORCED 
CIRCULATION BOILERS 

CW-210 Requirements for Flow or Temperature- 
Sensing Devices for Forced Circulation 
Boilers 

(a) In lieu of the requirements for low-water fuel cut- 
offs in CW-100, a water tube or coil- type boiler, requiring 
forced circulation to prevent overheating and failure of 
the tubes or coils, shall have an accepted safety control 
to prevent burner operation at a flow rate inadequate 
to protect the boiler unit against overheating, at all 
allowable firing rates. This safety control shall shut 
down the burner and prevent restarting until an ade- 
quate flow is restored. Positive means shall be provided 
to determine during testing that the accepted safety 
control has functioned upon an inadequate flow condi- 
tion. The positive means shall enable the accepted safety 
control to remain in the running safety lock circuitry 
during testing. The safety control must be automatically 
restored to service after completion of system testing. 

(b) When there is a definitive waterline, a low-water 
fuel cutoff complying with the applicable portions of 
CW-100 shall be provided in addition to the sensing 
device required in (a) above. Functioning of the low- 
water fuel cutoff shall cause a safety shutdown and 
lockout. 



CW-300 PRESSURE CONTROLS 

CW-310 Requirements for Pressure Controls for 
Steam Boilers 

(a) Each boiler pressure control shall conform to 
UL 353, Standard for Limit Controls, and shall be 
accepted by a nationally recognized testing agency. 



(b) Each automatically fired steam boiler or system 
of commonly connected steam boilers shall have at least 
one steam pressure control device that will shut off the 
fuel supply to each boiler or system of commonly con- 
nected boilers when the steam pressure reaches a preset 
maximum operating pressure. This requirement does 
not preclude the use of additional operating control 
devices where required. 

(c) In addition to the pressure control required in (b) 
above, each individual automatically fired steam boiler 
shall have a high steam pressure limit control that will 
prevent generation of steam pressure greater than the 
maximum allowable working pressure. Functioning of 
this control shall cause safety shutdown and lockout. 
The manual reset may be incorporated in the pressure 
limit control. Where the reset device is separate from 
the pressure limit control, a means shall be provided to 
indicate actuation of the pressure limit control. Each 
limit and operating control shall have its own sensing 
element and operating switch. 

EXCEPTION: Lockout is not required for boiler units installed 
in residences, as defined by the authority having jurisdiction. 

(d) A pressure limit control of the automatic or man- 
ual reset type shall be electrically connected in accor- 
dance with CE-llO(i). 

(e) No shutoff valve of any type shall be placed in 
the steam pressure connection between the boiler and 
the high-pressure limit control device and steam pres- 
sure control device or between the boiler and steam 
pressure control device. 

(f) Each pressure control device shall be protected 
with a siphon, or equivalent means of maintaining a 
water seal, that will prevent steam from entering the 
control. The minimum size of a siphon shall be NPS V 4 . 
Tubing suitable for the temperatures and pressures 
involved, with an inside diameter at least equal to stan- 
dard pipe sizes, may be substituted for pipe. When a 
control incorporating a mercury switch is mounted on 
the siphon, the loop of the siphon shall be in a plane 
that is 90 deg (1.57 rad) from the plane of the mercury 
switch. 

(g) Steam pressure supply connections to a single 
pressure control using pipe of nonf errous material shall 
not be less than NPS \ for lengths up to and including 
5 ft (1.5 m) and not less than NPS \ for lengths over 
5 ft (1.5 m). Tubing suitable for the temperatures and 
pressures involved, having an inside diameter at least 
equal to that of standard pipe, may be substituted for 
pipe. 

(h) Steam pressure supply connections to a single 
pressure control using pipe of ferrous material shall not 
be less than NPS V 2 for lengths up to and including 5 ft 
(1.5 m) and not less than NPS 1 for lengths over 5 ft 
(1.5 m). Tubing suitable for the temperatures and pres- 
sures involved, having an inside diameter at least equal 
to that of standard pipe, may be substituted for pipe. 



C 



13 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME C5D-1-2009 



(i) Pressure controls should have separate pressure 
connections; however, manifolding is permitted. When 
multiple controls are fed from a manifold, the manifold 
and common source connection to the boiler, for pipe 
of nonferrous material, shall not be less than NPS \ for 
lengths up to and including 5 ft (1.5 m) and not less 
than NPS % for lengths over 5 ft (1.5 m). For manifolds 
using ferrous material, the manifold and common source 
connection to the boiler shall not be less than NPS % 
for lengths up to and including 5 ft (1.5 m) and not less 
than NPS lV 4 for lengths over 5 ft (1.5 m). Individual 
controls are to be piped from the manifold according to 
the provisions of CW-310(g) and (h). 

(j) The upper set point limit or maximum fixed stop 
limit of the pressure control selected shall not exceed 
the maximum allowable working pressure of the boiler. 



CW-400 TEMPERATURE CONTROLS 

CW-410 Requirements for Temperature Controls for 
Hot-Water Heating and Supply Boilers 

(a) Each temperature control device shall conform to 
UL 353, Standard for Limit Controls, and shall be 
accepted by a nationally recognized testing agency. 

(b) Each automatically fired, hot- water boiler or each 
system of commonly connected hot-water boilers shall 
have at least one temperature-actuated control to shut 
off the fuel supply when the system water reaches a 
preset operating temperature. This requirement does not 
preclude the use of additional operating control devices 
where required. 

(c) In addition to the temperature control required in 
CW-410(b), each individual automatically fired 
hot- water boiler unit shall have a high temperature limit 
control that will prevent the water temperature from 
exceeding the maximum allowable temperature. The 
upper set point limit or the maximum fixed stop limit 
of the selected control shall not exceed the maximum 
allowable temperature. Functioning of this control shall 
cause safety shutdown and lockout. The manual reset 
may be incorporated in the temperature limit control. 
Where a reset device is separate from the temperature 
limit control, a means shall be provided to indicate actua- 
tion of the temperature limit control. Each limit and 
operating control shall have its own sensing element 
and operating switch. 

EXCEPTION: Lockout is not required for boiler units installed 
in residences, as defined by the authority having jurisdiction. 

(d) A temperature limit control of the automatic or 
manual reset type shall be electrically connected in 
accordance with CE-llO(i). 



CW-500 SAFETY AND SAFETY RELIEF VALVES 

CW-510 Requirements for Steam and Hot-Water 
Heating Boilers 

The safety and safety relief valves of all steam and 
hot-water heating boilers shall conform to the ASME 
Boiler and Pressure Vessel Code, Section I or IV, as 
applicable. 

CW-520 Requirements of Hot-Water Supply Boilers 

(a) Each hot-water supply boiler shall have at least 
one officially rated safety relief valve mounted directly 
on the boiler and set to relieve at or below the maximum 
allowable working pressure of the boiler. The required 
steam-relieving capacity in Btu/hr (W) shall equal or 
exceed the maximum Btu/hr (W) output rating of the 
boiler. 

(b) Each hot-water system consisting of a hot-water 
supply boiler and hot-water storage tank served by a 
hot-water supply boiler that is designed to operate at 
or below 210°F (99°C) shall have a temperature relief 
valve installed and set to relieve at or below 210°F (99°C). 
This valve shall be installed either in combination with 
that required in (a) above or within the top 6 in. (150 mm) 
of the system's hot-water storage tank. 

(c) Safety relief valves shall be installed and tested in 
accordance with the ASME Boiler and Pressure Vessel 
Code. Temperature relief valves shall be rated, tested, 
and installed in accordance with ANSI Z21.22/CSA 4.4 
and combination pressure-temperature relief valves in 
accordance with ANSI Z21.22/CSA 4.4 for temperature 
and the ASME Boiler and Pressure Vessel Code for 
pressure. 

CW-600 MODULAR BOILERS 

CW-610 Water Level Controls for Modular Steam 
Heating Boilers 

Modular steam heating boilers shall comply with 
CW-120, with the following differences: 

(a) Each module shall be equipped with an automatic 
low-water fuel cutoff. 

(b) The assembled modular steam boiler shall have a 
second low-water fuel cutoff mounted on a water col- 
umn attached to the manifolds, or may be mounted on 
one of the modules, where the return piping is below 
the lowest safe waterline and all modules will drain 
equally. Operation of this low- water fuel cutoff shall 
shut off the fuel or energy supply to all modules. 

CW-620 Pressure Controls for Modular Steam 
Heating Boilers 

Modular steam heating boilers shall comply with 
CW-310, with the following differences: 

(a) The assembled modular boiler shall have a pres- 
sure control that complies with CW-310(c). Operation 



14 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



of this control shall shut off the fuel or energy supply 
to all modules. 

(b) Each module shall have a pressure control that 
complies with CW-310(b). 

CW-630 Water Level Controls for Modular Hot-Water 
Boilers 

Modular hot-water boilers shall comply with CW-130, 
with the following differences: 

(a) The assembled modular boiler shall be protected 
by a low-water fuel cutoff located in the system piping 
such that it will detect a low- water condition before the 
level falls below the lowest safe waterline in any module. 



(b) Operation of the low-water fuel cutoff shall shut 
off the fuel or energy supply to all modules. 

CW-640 Temperature Controls for Modular Hot-Water 
Heating Boilers 

Modular hot-water boilers shall comply with CW-410, 
with the following differences: 

(a) The assembled modular boiler shall have a tem- 
perature control that complies with CW-410(c). Opera- 
tion of this control shall shut off the fuel or energy supply 
to all modules. 

(b) Each module shall have a temperature control that 
complies with CW-410(b). 



15 



Copyright © 2009 by the American Society of Mechanical Engineers. & 

No reproduction may be made of this material without written consent of ASME. « 



ASME CSD-1-2009 



Part CF 
Combustion Side Control 



CF-100 GAS-FIRED BOILER UNITS, EQUIPMENT 

CF-110 Burner Assemblies and Boiler Units 

(09) (a) Burner assemblies for boiler units having inputs 
in excess of 400,000 Btu/hr (117 228 W) shall comply 
with the provisions of this Part. Burner assemblies, as 
part of a boiler unit or separately, shall be labeled and 
listed by a nationally recognized testing agency or other 
organization that is acceptable to the authority having 
jurisdiction as complying with the standards referenced 
below. For a burner provided as an integral part of a 
boiler unit, the label on the boiler unit may serve as 
evidence that the burner is in compliance. 

(1) UL 795, Standard for Commercial-Industrial 
Gas Heating Equipment 

(2) ANSI Z21.13/CSA 4.9, Gas-Fired Low Pressure 
Steam and Hot Water Boilers or 

(3) ANSI Z21.56/CSA 4.7, Gas-Fired Pool Heaters 
(b) Boiler units having inputs of 400,000 Btu/hr 

(117 228 W) or less, with field-installed gas burner 
assemblies, and boiler units that do not comply with 
ANSI Z21.13/CSA 4.9 shall comply with the provisions 
for purging, safety control timing, action on flame fail- 
ure, loss of combustion air, combustion air proving, and 
fuel supervision given in Table CF-1 or CF-2, as 
applicable. 
(09) (c) Field-installed, oil-fired assemblies having inputs 
of 400,000 Btu/hr (117 228 W) or less shall be labeled 
and listed by a nationally recognized testing agency or 
other organization that is acceptable to the authority 
having jurisdiction as complies with ANSI Z21.17/CSA 
2.7, Standard for Domestic Gas Conversion Burners. The 
units on which they are installed shall comply with the 
provisions of this Standard. 

(d) Boilers firing liquefied-petroleum gases or LP-gas 
air mixtures that do not comply with ANSI Z21.13/CSA 
4.9, which are installed indoors, shall be equipped with 
safety shutoff devices of the complete shutoff type. A 
safety shutoff device of the complete shutoff type is one 
that will shut off the gas flow to both the main and pilot 
burner(s) in the event of main flame, pilot flame, or 
ignition failure. 

(e) The provisions of this Part are intended to apply 
to equipment supplied with gas pressures not in excess 
of the following: 

(1) 10 psig (69 kPa gage) for boilers firing gas-air 
mixtures within the flammable range (i.e., 5% to 15% by 



volume natural gas in air and 2.15% to 9.6% by volume 
propane in air) 

(2) 20 psig (140 kPa gage) for boilers firing 
liquefied-petroleum gas 

(3) 60 psig (414 kPa gage) for all other boilers 

CF-120 Fuel Train 

(a) See Nonmandatory Appendix B for typical fuel 
train diagrams. Fuel train designs, other than those pic- 
tured in Nonmandatory Appendix B, but meeting the 
requirements of this Standard, shall be permitted. 

(b) Thread sealing compounds used on threaded 
joints of gas piping shall be resistant to the action of 
liquefied-petroleum gases. 

CF-1 30 Filters or Strainers 

Fuel cleaning equipment such as filters or strainers 
are recommended for use in the main gas supply line 
to the unit. 

CF-140 Sediment Traps and Drips 

(a) A sediment trap shall be installed upstream of the 
gas control(s). When a vertical section of piping supplied 
by the manufacturer is on the upstream side of the gas 
control(s), a sediment trap shall be installed. When a 
vertical section of piping is not supplied, installation 
instructions supplied by the manufacturer shall specify 
that a sediment trap be installed as close to the gas 
control (s) as practical at the time of the boiler's instal- 
lation. 

(b) For other than dry gas conditions, a drip shall be 
provided at any point in the line of pipe where conden- 
sate could collect. 

CF-150 Manually Operated Gas Shutoff Valves 

(a) Manually operated main shutoff and pilot shutoff 
valves shall be ball or lubricated plug type, with stops. 

(b) All manually operated valves shall be of the 
T-handle or lever-handled type with the handle parallel 
to the gas flow only when in the open position and 
perpendicular to the gas flow only when in the closed 
position. The valve shall be accessible, and the handle 
position shall clearly indicate the "open" and "closed" 
positions. The handle shall be of adequate size to permit 
opening and closing the valve without the use of tools. 
All manually operated shutoff valves shall be main- 
tained and exercised in accordance with the manufactur- 
er's instructions to ensure the valve remains operable 
without the use of tools. 



(09) 



(09) 



16 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



? 






(09) 



Table CF-1 400,000 Btu/hr (117 228 W) and Smaller (Gas - Natural Draft) 



►8 



S. |}* 
B © 

V O 



fr 



t» a. 

I § 

3. SP 

£ O 



o 

§ W 

& a- 

L '' Si 



Pilot Ignition Gas 



Safety Control 



Continuous Pilot 



Intermittent Pilot 



Interrupted Pilot 



Direct Ignition System 



Purge requirements 
[Note (1)] 

Pilot flame-establishing period 



Main burner flame-establishing 
period 

Flame failure response time 
[Note (2)] 

Pilot 

Main burner 

Valve closing time 



Action on pilot flame failure 
[Note (1)] 



None 

None 
None 



180-sec maximum 
Not applicable 

Not applicable 



Safety shutdown 



Action on main burner flame fail- Not applicable 

ure [Note (1)] 



Fuel pressure supervision 



Not required 



None 

15-sec maximum 

None 



4-sec maximum 
Not applicable 

5-sec maximum after 
de-energization 

Safety shutdown 
[Note (2)] 

Not applicable 



Not required 



None 

15-sec maximum 
15-sec maximum 



4-sec maximum 
4-sec maximum 

5-sec maximum after 
de-energization 

Safety shutdown 
[Note (2)] 

Safety shutdown 
[Note (2)] 

Not required 



None 

15-sec maximum 
15-sec maximum 



Not applicable 
4-sec maximum 

5-sec maximum after 
de-energization 

Not applicable 



Safety shutdown 
[Note (2)] 

Not required 



Hot Surface Ignition 



None 

15-sec maximum 
15-sec maximum 



Not applicable 
4-sec maximum 

5-sec maximum after 
de-energization 

Not applicable 



Safety shutdown 
Not required 



GENERAL NOTE: Timings shown above represent the maximum primary safety control timings permitted by this Standard. 

together with the timings shall be provided in the documentation of the burner/boiler. 

NOTES: 

(1) After safety shutdown, wait a minimum 5-min time delay before resetting ignition system (instructional requirement). 

(2) If the ignition system includes a relight feature, one relight attempt shall be initiated within 0.8 sec upon loss of flame. 



The model designation of the installed primary safety control 



o 
o 

VO 



(09) 



It 
ft 



03 «-K 



* r 

3. O 

g. o 

I* 

£ o 
o >-+> 

H 

2 B. 
o o^ 

af 

> J 3 



Table CF-2 400,000 Btu/hr (117 228 W) and Smaller (Power Gas Burners and Mechanical 
Draft Atmospheric Gas Burners), 3 gph (11.4 L/h) and Smaller (Oil) 



Pilot Ignition Gas 



Direct Ignition System 



Safety Control 



Continuous Pilot 



Intermittent Pilot 



Interrupted Pilot 



Gas 



Oil 



Hot Surface Ignition 
Gas Only 



Purge requirements 
[Note (1)] 



None 



None 



None 



None 



None 



None 



Pilot flame-establishing period 


None 


15-sec maximum 


15-sec maximum 


Not applicable 


Not applicable 


Not applicable 




Main burner flame-establishing 
period 


None 


None 


15-sec maximum 


15-sec maximum 


30-sec maximum 


15-sec maximum 




Flame failure response time 
[Note (2)] 














> 


Pilot 

Main burner 


180-sec maximum 
Not applicable 


4-sec maximum 
Not applicable 


4-sec maximum 
4-sec maximum 


Not applicable 
4-sec maximum 


Not applicable 
30-sec maximum 


Not applicable 
4-sec maximum 


5 
m 


Valve closing time 


None 


5-sec maximum 
after 
de-energization 


5-sec maximum 
after 
de-energization 


5-sec maximum after 
de-energization 


Not applicable 


5-sec maximum after 
de-energization 


i 

NJ 
O 

o 


Action on pilot flame failure 


Safety shutdown 


Safety shutdown 
[Note (1)] 


Safety shutdown 
[Note (2)] 


Not applicable 


Not applicable 


Not applicable 




Action on main burner flame 
failure 


None 


None 


Safety shutdown 
[Note (2)] 


Safety shutdown 
[Note (2)] 


Safety shutdown 
[Note (2)] 


Safety shutdown 




Fuel pressure supervision 


Not required 


Not required 


Not required 


Not required 


Not required 


Not required 





GENERAL NOTE: Timings shown above represent the maximum primary safety control timings permitted by this Standard. The model designation of the installed primary safety control 

together with the timings shall be provided in the documentation of the burner/boiler. 

NOTES: 

(1) After safety shutdown, wait a minimum 5-min time delay before resetting ignition system (instructional requirement). 

(2) If ignition system includes a relight feature, one relight attempt shall be initiated within 0.8 sec upon loss of flame. 



ASME CSD-1-2009 



(c) Except as allowed in (d) below, the handle for all 
manually operated shutoff valves shall be permanently 
attached. 

(d) Where permanently attached handles are not 
available or where the handle of a manual shutoff valve 
creates a personnel obstruction or hazard when the valve 
is in the closed position, a removable handle shall be 
permitted provided all the following requirements are 
satisfied: 

(1) The handle shall remain installed on the valve 
at all times when the valve is open. 

(2) Following removal, reattachment shall only be 
possible such that the handle is perpendicular to the gas 
flow with the valve in the closed position. 

(3) Valve position shall be clearly indicated 
whether the handle is attached or detached. 

(4) Upon removal, the valve handle shall be reori- 
ented (turned 180 deg) and reattached to eliminate the 
personnel obstruction or hazard, or if remaining 
detached, the valve handle shall be tethered to the gas 
main no more than 3 ft from the valve in a manner 
that does not cause personnel safety issues and allows 
trouble-free reattachment of the handle and operation 
of the valve without untethering the handle. 

(5) A handle tethered in accordance with (4) above 
shall only be permitted when the line in which the valve 
is located is tagged /locked out to prevent operation. 

(e) A manually operated shutoff valve, as described 
in (a) through (d) above, shall be provided upstream 
from all other main gas line controls to isolate the boiler 
fuel train from the fuel supply. The valve shall be located 
within 6 ft of the boiler and must be readily accessible 
from the boiler room floor. 

(f) When the pilot gas supply is obtained indepen- 
dently from the main burner fuel supply or upstream 
of the manual shutoff valve required in (e) above, a 
manually operated shutoff valve, as described in (a) 
through (d) above, shall be located in the gas supply 
line to the pilot burner(s). When the pilot gas supply 
is obtained downstream of the manual shutoff valve 
required in (e) above, one or more manual shutoff valves 
or other means shall be provided as required to permit 
pilot turndown tests and /or pressurization of the pilot 
fuel train without pressurizing the main fuel train. 

(g) A manually operated shutoff valve, as described 
in (a) through (d) above, shall be provided after the 
downstream safety shutoff valve for each fuel train. 

CF-160 Gas-Pressure Regulators 

(09) (a) Individual gas-pressure regulators or gas-pressure 
regulators that are part of a combination valve shall be 
furnished for both pilot fuel lines (if a pilot is used) and 
main fuel lines of gas-fired boiler units in accordance 
with ANSI Z21.78/CSA 6.20, Combination Controls for 
Gas Appliances. The gas pressure at the outlet of the 
regulator shall be within ±10% of the regulation set point 



at all firing rates. A pressure test port shall be provided 
to permit measuring the gas pressure to confirm compli- 
ance with the requirements of this paragraph. 

(b) Gas-pressure regulators incorporating integral 
vent limiters shall comply with the applicable provisions 
of ANSI Z21.18/CSA 6.3, Gas Appliance Pressure 
Regulators. 

(c) Second stage gas-pressure regulators on boilers 
firing liquefied-petroleum gas or LP-gas air mixtures 
shall comply with UL 144, Standard for LP-Gas Regulat- 
ing, and shall be installed in accordance with the NFPA 
58, Liquefied-Petroleum Gas Code. 

CF-161 Overpressure Protection 

(a) When the maximum allowable working pressure 
of any component is less than the gas pressure entering 
a building, so that failure of a gas system pressure regu- 
lator would produce downstream pressures greater than 
that rating, the downstream piping system shall be pro- 
vided with overpressure protection. 

(b) Gas overpressure protection devices, if required, 
shall be located upstream of all operating and safety 
controls and in both the main burner and, if applicable, 
the pilot burner gas supply system. The gas overpressure 
protection devices shall be vented to a safe point of 
discharge, if required. 

(c) Refer to CG-210 for additional requirements. 

(d) Overpressure protection, if required, may be pro- 
vided by any of the devices listed in the latest edition 
of NFPA 54/ANSI Z223.1, National Fuel Gas Code. 

CF-162 Pressure Switches 

(a) Gas-pressure supervision shall be provided on gas 
trains, as specified in Table CF-3 or CF-4, by pressure 
switches interlocked to accomplish a safety shutdown 
and lockout in the event of either high or low gas pres- 
sure. The pressure switch monitoring high gas pressure 
shall function to cause safety shutdown and lockout 
before the manifold gas pressure exceeds 150% of the 
boiler /burner's main manifold gas pressure. The pres- 
sure switch monitoring low gas pressure shall function 
to cause safety shutdown and lockout before the mani- 
fold gas pressure is less than 50% of the boiler /burner's 
main manifold gas pressure. Pressure test port(s) shall 
be provided to permit measuring the gas pressure(s) 
to confirm compliance with the requirements of this 
paragraph. 

(b) Gas-pressure switches shall be labeled and listed 
by a nationally recognized testing agency. 

(c) The low gas-pressure switch shall be located 
upstream of the safety shutoff valve (s). The high gas- 
pressure switch shall be located downstream of the gas- 
pressure regulator and may be located downstream of 
all main burner gas supply controls. When the low gas- 
pressure switch is located upstream of the main 
gas-pressure regulator, the burner shall be labeled and 



(09) 



19 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



(09) 



Table CF-3 Safety Controls for Automatically Fired Units: Power Gas Burners and Mechanical Draft Atmospheric Gas Burners 



Safety Control 



Greater Than 400,000 Btu/hr 

(117 228 W) and Less Than or Equal to 

2,500,000 Btu/hr (732 678 W) 



Greater Than 2,500,000 Btu/hr 

(732 678 W) and Less Than or Equal to 

5,000,000 Btu/hr (1 465 356 W) 



Greater Than 5,000,000 Btu/hr 

(1 465 356 W) and Less Than 

12,500,000 Btu/hr (3 663 389 W) 



Purge requirements 



o 

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3 % 

at 
a © 

S3 K> 
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i i 

3. g 5 

> a!* 

I* 

^ o 
O »-h 



I 



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V3 



Pilot flame type and establishing period 
Continuous 
Interrupted 
Intermittent 

Main burner ignition type and establish- 
ing period 



Flame failure response time 

Valve closing time 

Action on flame failure 

Action on power or control input interrup- 
tion after safety shutdown and lockout 

Proven low fire start 

Combustion air proving — action on loss 
of combustion air 

Fuel pressure supervision 



Four air changes in 90 sec, or at 60% 
damper opening, with both damper open- 
ing and air flow proven [Note (1)] 

Air changes to include fire box and boiler 
passes 

Instructional requirement: minimum 
5-min shutoff before lighting constant 
pilot 

15 sec (initial start only) 
15 sec 
15 sec 

Pilot only: 15-sec maximum if interrupted 

pilot used 
Direct ignition system: 4-sec maximum 
Hot surface ignition system: 4-sec maximum 

4-sec maximum 

5-sec maximum after de-energization 

Safety shutdown and lockout or recycle once 

Manual reset required in accordance with 
para. CG-610 

Not required 

Required: safety shutdown and lockout or 
recycle 

Not required for ignition systems with pilots. 
Required for direct ignition and hot surface 
ignition systems: high and low gas pres- 
sure arranged to cause safety shutdown 
and lockout. 



Four air changes at 60% damper opening 
with both damper opening and air flow 
proven [Note (1)] 



Four air changes at 60% damper opening 
with both damper opening and air flow 
proven 



Not permitted 

10 sec 

Not permitted 

Interrupted pilot only, 10-sec maximum 
Direct ignition system: 4-sec maximum 
[Note (2)3 

Hot surface ignition system: 4-sec maximum 
[Note (2)] 

4-sec maximum 

1-sec maximum 

Safety shutdown and lockout 

Manual reset required in accordance with 
para. CG-610 

See para. CF-610 

Required: safety shutdown and lockout 

Required: high and low gas pressure 
arranged to cause safety shutdown and 
lockout 



Not permitted 

10 sec 

Not permitted 

Interrupted pilot only, 10-sec maximum 



4-sec maximum 

1-sec maximum 

Safety shutdown and lockout 

Manual reset required in accordance with 
para. CG-610 

See para. CF-610 

Required: safety shutdown and lockout 

Required: high and low gas pressure 
arranged to cause safety shutdown and 
lockout 



GENERAL NOTE: Timings shown above represent the maximum primary safety control timings permitted by this Standard. The model designation of the installed primary safety control 

together with the timings shall be provided in the documentation of the burner/boiler. 

NOTES: 

(1) For dampers with a fixed mechanical stop, see paras. CF-210(a)(l) and (a)(2). 

(2) Maximum input at light off shall be less than or equal to 2,500,000 Btu/hr (732 678 W). 



(09) 



Table CF-4 Safety Controls for Automatically Fired Units: Atmospheric Gas Burners — Natural Draft 



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Safety Control 



Greater Than 400,000 Btu/hr 

(117 228 W) and Less Than or Equal to 

2,500,000 Btu/hr (732 678 W) 



Greater Than 2,500,000 Btu/hr 

(732 678 W) and Less Than or Equal to 

5,000,000 Btu/hr (1 465 356 W) 



Greater Than 5,000,000 Btu/hr 

(1 465 356 W) and Less Than 

12,500,000 Btu/hr (3 663 389 W) 



Purge Requirements 



Pilot flame type and establishing period 

Continuous 
Interrupted 
Intermittent 

Main burner ignition type and establish- 
ing period 



Flame failure response time 

Valve closing time 

Action on flame failure 

Action on power or control input interrup- 
tion after safety shutdown and lockout 

Proven low fire start 

Combustion air proving — action on loss 
of combustion air 

Fuel pressure supervision 



None, if unrestricted air passages; if automatic burner dampers are used, prove open 90-sec 
Instructional requirement: minimum 5-min complete fuel shutoff period before lighting constant pilot 



15 sec (initial start only) 
15 sec 
15 sec 

Pilot only; 15-sec maximum if interrupted 

pilot used, 
Direct ignition system: 4-sec maximum 
Hot surface ignition system: 4-sec maximum 



4-sec maximum 

5-sec maximum after de-energization 

Safety shutdown and lockout or recycle once 

Manual reset reqauired in accordance with 
para, CG-610 

Not required 

Required: safety shutdown and lockout or 
recycle 

Not required for ignition systems with pilots. 
Required for direct ignition and hot sur- 
face ignition systems: high and low gas 
pressure arranged to cause safety shut- 
down and lockout. 



10 sec (initial start only) 
10 sec 
10 sec 

Interrupted pilot only, 10-sec maximum 

Direct ingition system: 4-sec maximum [Note (2)] 
Hot surface ignition system: 4-sec maximum 
[Note (2)] 

4-sec maximum 

1-sec maximum 

Safety shutdown and lockout 

Manual reset required in accordance with 
para. CG-610 

See para. CF-610 

Required: safety shutdown and lockout 



10 sec (initial start only) 
10 sec 
10 sec 

Interrupted pilot only; 10-sec maximum 



4-sec maximum 

1-sec maximum 

Safety shutdown and lockout 

Manual reset required in accordance with 
para. CG-610 

See para. CF-610 

Required: safety shutdown and lockout 



> 

m 
O 



o 
o 



Required: high and low gas pressure arranged to Required: high and low gas pressure 
cause safety shutdown and lockout arranged to cause safety shutdown 

and lockout 



GENERAL NOTE: Timings shown above represent the maximum primary safety control timings permitted by this Standard. The model designation of the installed primary safety control 

together with the timings shall be provided in the documentation of the burner/boiler. 

NOTES: 

(1) For dampers with a fixed mechanical stop, see paras. CF-210(a)(l) and (a)(2). 

(2) Maximum input at light off shall be less than or equal to 2,500,000 Btu/hr (732 678 W). 



ASME CSD-1-2009 



listed by a nationally recognized testing agency for this 
arrangement. 

(d) Gas-pressure switches shall be capable of with- 
standing without damage a pressure of not less than 
10% above the relieving pressure of the nearest upstream 
relief device. Where no relief device is provided, the 
gas-pressure switches shall be capable of withstanding 
without damage a pressure of not less than the maxi- 
mum inlet pressure of the nearest upstream gas-pressure 
regulator. When the high gas-pressure switch is located 
downstream of the safety shutoff valve(s) / the high gas- 
pressure switch shall be capable of withstanding with- 
out damage a pressure of not less than 50% above its 
upper set point limit or 5 psig, whichever is greater. 

(e) Gas-pressure switches of the automatic or manual 
reset type shall be electrically connected in accordance 
with CE-llO(i). 

CF-170 Control Valves 

(a) An automatic input complete closure, control 
valve may be combined with a safety shutoff valve. 

(b) A bypass to provide for a minimum flame may 
be installed around a valve used to control input only. 
A bypass shall not be installed around a safety shutoff 
valve or a combination input control and safety shutoff 
valve. 

(09) CF-180 Safety Shutoff Valves 

(a) Each main burner supply line shall be equipped 
with a safety shutoff valve(s) that shall comply with the 
applicable provisions of ANSI Z21.21/CSA 6.5, Auto- 
matic Valves for Gas Appliances, ANSI Z21.78/CSA 
6.20, Combination Gas Controls for Gas Appliances, or 
UL 429, Standard for Electrically Operated Valves. 

(b) The burner supply line shall be equipped as indi- 
cated below for the applicable input classification or any 
greater input classifications: 

(1) For boiler units having inputs less than or equal 
to 5,000,000 Btu/hr (1 465 356 W), the main burner sup- 
ply line shall be equipped with at least two safety shutoff 
valves in series that may be in a single valve body or 
one safety shutoff valve with a valve seal overtravel 
(proof of closure) interlock function. If the two safety 
shutoff valves are in a single valve body, the two safety 
shutoff valve seats shall be in series and shall have inde- 
pendently operated valve shafts. 

(2) For boiler units having inputs greater than 
5,000,000 Btu/hr (1 465 356 W) and less than 12,500,000 
Btu/hr (3 663 389 W), the main burner supply line shall 
be equipped with at least two safety shutoff valves in 
series that may be in a single valve body. At least one 
of the two safety shutoff valves shall incorporate a valve 
seal overtravel (proof of closure) interlock function. If 
the two safety shutoff valves are in a single valve body, 
the two safety shutoff valve seats shall be in series and 
shall have independently operated valve shafts. When 



the input of a branch gas supply is greater than 2,500,000 
Btu/hr (732 678 W), the branch valve requirements are 
determined by the branch input. 

(c) The pilot gas supply line shall be equipped with a 
safety shutoff valve that shall comply with the applicable 
provisions of ANSI Z21.21/CSA 6.5, Automatic Gas 
Valves for Gas Appliances; ANSI Z21.78/CSA 6.20, 
Combination Gas Controls for Gas Appliances; or UL 
429, Standard for Electrically Operated Valves. 

(d) Safety shutoff valves shall be labeled and listed 
by a nationally recognized testing agency. 

(e) Safety shutoff valves shall have a shutoff time not 
to exceed that specified in Table CF-1, CF-2, CF-3, or 
CF-4. 

(f) Safety shutoff valves shall be capable of withstand- 
ing, without damage, a pressure of not less than 10% 
above the set point of the nearest upstream overpressure 
protection device. In case no overpressure protection 
device is provided, the safety shutoff valves shall be 
capable of withstanding, without damage, a pressure of 
not less than the maximum inlet pressure to the nearest 
upstream gas-pressure regulator. 

(g) A means shall be provided to independently leak 
test each main burner safety shutoff valve. Where a 
separate leakage test valve(s) is required to perform the 
test, the leakage test valve (s) shall be NPS \ or larger 
and shall be in accordance with the requirements of 
CF-150(a) through (d). The outlet of all leak test connec- 
tions shall be plugged or capped, except when used 
during testing (see Nonmandatory Appendix B and 
Part CM). 

CF-1 90 Atmospheric Vents and Gas Vent, Bleed, or 
Relief Lines 

(a) Gas-pressure regulators, including second stage 
LP-gas-pressure regulators, not incorporating integral 
vent limiters, pressure interlock switches, and all other 
valve train components requiring atmospheric air pres- 
sure to balance a diaphragm or other similar device, 
shall be provided with a pipe-threaded connection for 
the vent line. These lines shall be sized in accordance 
with the component manufacturer's instructions. For 
second stage LP-gas-pressure regulators, the relief line 
shall be at least the same size as the outlet of the pressure- 
relieving device. Vent and relief lines shall be piped by 
the installer to the outdoors at a safe point of discharge 
as determined by the authority having jurisdiction. A 
means shall be provided at the terminating point to 
prevent blockage of the line by foreign material, mois- 
ture, or insects. Where there is more than one gas- 
pressure regulator at a location, each gas-pressure regu- 
lator shall have a separate vent to the outdoors at a safe 
point of discharge as determined by the authority having 
jurisdiction. If approved by the authority having juris- 
diction, the vent lines may be manifolded in accordance 
with accepted engineering practices [see (b) and (c) 



22 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



below] to minimize back pressure in the event of dia- 
phragm failure. 

(b) Atmospheric vent lines, when manifolded, shall be 
connected into a common atmospheric vent line having a 
cross-sectional area not less than the area of the largest 
vent line plus 50% of the areas of the additional vent 
lines. 

(c) Atmospheric vent lines shall not be connected to 
any common or manifolded gas vent, bleed, or relief 
lines. 

(d) Gas vent, bleed, or relief lines shall have provisions 
to be piped by the installer to the outdoors at a safe 
point of discharge as determined by the authority having 
jurisdiction. A means shall be provided at the terminal 
point to prevent stoppage of the lines by foreign mate- 
rial, moisture, or insects. However, a gas bleed line from 
a diaphragm control valve and vent line from a pressure 
regulator may be vented to a constant burning pilot. 
An internal (within the valve) gas bleed line from a 
diaphragm control valve or combination valve/ 
regulator is allowed, with or without a continuous pilot, 
if the construction of the valve is such that when a valve 
is in the closed position, a damaged main diaphragm 
will not allow gas to flow through the bleed line to the 
main burner. At locations where gas-pressure regulators 
might be submerged during floods, a special antiflood- 
type breather vent fitting shall be installed, or the vent 
line shall be extended above the height of the expected 
flood waters. 

(e) The bleed line from a diaphragm control valve or a 
vent line from a pressure regulator to a constant burning 
pilot shall terminate in burner tips made of metal having 
a melting point greater than 1,450°F (788°C). These tips 
shall be located so that the escaping gas will be readily 
ignited by the pilot flame. Bleed line burners shall be 
securely held so that the ports are in a fixed position in 
relation to the pilot flame. A gas-pressure regulator shall 
not be vented into the boiler flue or exhaust system. 

(f) Gas-pressure relief valves may discharge into com- 
mon manifolding only with other gas vent, bleed, or 
relief lines. When manifolded, the common vent line 
shall have a cross-sectional area not less than the area 
of the largest vent line plus 50% of the areas of the 
additional vent lines. 

CF-200 GAS-FIRED BOILER UNITS, PURGING 

CF-210 Preignition Purging (See Table CF-3 or CF-4) 

(09) (a) Power gas burners and mechanical draft atmo- 
spheric gas burners shall provide for preignition purging 
of the combustion chamber and flue passages. The purge 
shall provide no fewer than either 

(1) four air changes, within 90 sec or 

(2) four air changes at not less than 60% damper 
opening with both damper opening and air flow proven 



Boiler units less than or equal to 5,000,000 Btu/hr 
(1 145 356 W) input utilizing burners labeled and listed 
by a nationally recognized testing agency and designed 
with a fixed mechanical stop to prevent the damper from 
going below an air flow rate at least equivalent to that 
provided for combustion at 60% of the rated high-fire 
input are exempt from proving damper opening. 

(b) Lightoff instructions for boiler units equipped 
with manually lighted, constant burning pilots shall 
specify a minimum 5-min complete shutoff period 
before the pilot is lighted. 

(c) Natural draft atmospheric gas burners equipped 
with an automatically operated air shutter or damper 
that is closed or positioned to restrict the passage of air 
when the burner is not firing shall provide means to 
open such air shutters or dampers to the high-fire posi- 
tion for a period of at least 90 sec immediately before 
each lightoff cycle is initiated. Compliance with ANSI 
Z21.13/CSA 4.9 satisfies the intent of this provision. 

CF-220 Control 

Boiler units having power gas burners or mechanical 
draft atmospheric gas burners shall comply with one of 
the following for safety shutdown and lockout, or recy- 
cle, as applicable; 

(a) recycle is permitted following loss of combustion 
air for boiler units having inputs greater than 400,000 
Btu/hr (117 228 W) and less than or equal to 2,500,000 
Btu/hr (732 678 W) or 

(b) loss of combustion air shall result in safety shut- 
down and lockout for boiler units having inputs greater 
than 2,500,000 Btu/hr (732 678 W) 



CF-300 GAS-FIRED BOILER UNITS, SAFETY 
CONTROLS 

CF-310 Primary Safety Control 

(a) Each main burner assembly shall be provided with 
a primary safety control that will deenergize the main 
gas shutoff valve(s) and shut off pilot fuel upon loss of 
flame at the point of supervision as specified in CF-330. 

(b) The response time of the primary safety control 
to deenergize or activate the gas shutoff device shall not 
exceed the values shown in Tables CF-1 through CF-4. 

(c) Primary safety controls shall be labeled and listed (09) 
by a nationally recognized testing agency 

(d) Primary safety controls shall require local manual 
intervention by an operator or service technician to reset. 
Devices that can electronically reset without local man- 
ual intervention, such as when power or control input 
to the device is interrupted and then restored, shall not 
be permitted. 

(e) Supervision of the main burner flame alone shall 
begin at the end of the main burner flame-establishing 
period for 



23 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



(1) power gas burners and mechanical draft atmo- 
spheric gas burners having inputs greater than 2,500,000 
Btu/hr (732 678 W) 

(2) all types of burners with modulating or 
high-low firing having inputs greater than 2,500,000 
Btu/hr (732 678 W) 

(3) all types of burners with an interrupted pilot(s) 

(4) natural draft atmospheric gas burners having 
inputs greater than 5,000,000 Btu/hr (1 465 356 W) 

(f) The main burner flame-establishing period shall 
not exceed the values shown in Tables CF-1 through 
CF-4. 
(09) CF-320 Automatic Ignition Devices 

(a) Automatic ignition devices using pilots shall com- 
ply with the following: 

(1) Gas to pilots shall be automatically shut off if 
the pilot is not proved. 

(2) The pilot type and flame-establishing period 
shall meet the provisions shown in Tables CF-1 through 
CF-4. 

(3) The flame failure response time for additional 
pilots used for smooth lightoff shall not exceed 90 sec. 

(b) A single direct ignition or hot surface ignition 
system may be used on a boiler unit that has a natural 
draft atmospheric gas burner with a total input less 
than or equal to 400,000 Btu/hr (117 228 W). This direct 
ignition or hot surface ignition system shall meet the 
provisions shown in Table CF-1. 

(c) Multiple direct ignition or hot surface ignition sys- 
tems may be used on a boiler unit that has a natural 
draft atmospheric gas burner with a total input less than 
or equal to 2,500,000 Btu/hr (732 678 W) and an input 
less than or equal to 400,000 Btu/hr (117 228 W) per 
ignition system. There shall be no interconnection 
between combustion zones served by separate ignition 
systems at any point below the draft hood or, if no draft 
hood is used, below the flue outlet. 

Each direct ignition or hot surface ignition system 
shall meet the provisions shown in Table CF-1. 

(d) A direct ignition or hot surface ignition system 
may be used on a boiler unit that has a power gas burner 
or mechanical draft atmospheric gas burner with a total 
input less than or equal to 5,000,000 Btu/hr (1 465 356 
W) and a maximum input at ignition less than or equal 
to 2,500,000 Btu/hr (732 678 W). This direct ignition or 
hot surface ignition system shall meet the provisions 
shown in Table CF-3 if the total input is greater than 
400,000 Btu/hr (117 228 W). This direct ignition or hot 
surface ignition system shall meet the provisions shown 
in Table CF-2 if the total input is less than or equal to 
400,000 Btu/hr (117 228 W). 

CF-330 Action on Flame Failure (Refer to Tables CF-1 
Through CF-4) 

Gas-fired boiler units shall comply with one of the 
following for safety shutdown, lockout, recycle, or 
relight upon loss of flame as applicable: 



(a) Loss of flame for power gas burners and mechani- 
cal draft atmospheric gas burners having inputs greater 
than 400,000 Btu/hr (117 228 W) and less than or equal 
to 2,500,000 Btu/hr (732 678 W) shall result in a safety 
shutdown and lockout or recycle. 

(b) Loss of flame for power gas burners and mechani- 
cal draft atmospheric gas burners having inputs greater 
than 2,500,000 Btu/hr (732 678 W) shall result in safety 
shutdown and lockout. 

(c) Loss of flame for atmospheric gas burners using 
natural draft having inputs greater than 400,000 Btu/hr 
(117 228 W) and less than or equal to 12,500,000 Btu/hr 
(3 663 389 W) shall result in safety shutdown and lock- 
out, or recycle, after a minimum 5-min time delay. 

(d) Loss of pilot flame for gas-fired boilers using natu- 
ral draft burners and power gas burners with inputs 
less than or equal to 400,000 Btu/hr (117 228 W) shall 
result in safety shutdown for a continuous, intermittent, 
or interrupted pilot. Relight may be applied to the inter- 
mittent or interrupted pilot if initiated within 0.8 sec 
upon loss of pilot flame. 

(e) Loss of main flame for gas-fired boilers using natu- (09) 
ral draft burners and power gas burners with inputs 

less than or equal to 400,000 Btu/hr (117 228 W) shall 
result in safety shutdown for interrupted pilot direct 
ignition or hot surface ignition systems. Relight may be 
applied to the interrupted pilot or direct ignition system 
if initiated within 0.8 sec upon loss of flame. 



CF-400 OIL-FIRED BOILER UNITS, EQUIPMENT 
CF-410 Burner Assemblies 

(a) Burner assemblies that have a maximum name- 
plate fuel input rating greater than 3 gph (11.4 L/h) 
shall comply with the provisions of this section. Burner 
assemblies, as part of a boiler unit or separately, shall 
be labeled and listed by a nationally recognized testing 
agency or other organization that is acceptable to the 
authority having jurisdiction as complying with the 
standards referenced below. For a burner provided as 
an integral part of a boiler unit, the label on the boiler 
unit may serve as evidence that the burner is in com- 
pliance. 

(1) UL 296, Standard for Oil Burners 

(2) UL 726, Standard for Oil-Fired Boiler 
Assemblies or 

(3) UL 2096, Commercial Industrial Gas and /or Oil 
Burning Assemblies With Emission Reduction 
Equipment 

(b) Boiler units that have fuel input ratings less than 
or equal to 3 gph (11.4 L/h), with field-installed oil 
burner assemblies and boiler units that do not comply 
with UL 726, shall comply with the provisions for purg- 
ing, safety control timing, action on flame failure, loss 
of combustion air, combustion air proving, and fuel 
supervision given in Table CF-2. 



(09) 



24 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



(c) Field-installed burner assemblies having inputs of 
3 gph (11.4 L/h) or less shall be labeled and listed by 
a nationally recognized testing agency or other organi- 
zation that is acceptable to the authority having jurisdic- 
tion, as complies with UL 296. The units on which they 
are installed shall comply with the provisions of this 
Standard. 

CF-420 Fuel Train 

See Nonmandatory Appendix B for typical fuel train 
diagrams. 

CF-430 Filters or Strainers 

Filters and strainers shall be installed upstream from 
the safety shutoff valve(s). 

CF-440 Relief Valves 

(a) A pressure relief valve shall be connected to a 
fuel line in which pressure greater than system design 
pressure may build up from the closing of any valve in 
the burner assembly or from oil heated by a preheater. 

(b) The relief line from the relief valve shall discharge 
into the return line, oil tank, or pump suction line. 

CF-450 Pressure and Temperature Switches 

(a) All oil supplied to the main burner shall be super- 
vised by a low oil pressure interlock switch for systems 
greater than 20 gph (757 L/h) (except for rotary cup 
burners), unless the oil pump is integral with the burner's 
motor shaft, to cause a safety shutdown and lockout if oil 
pressure falls below the manufacturer's design pressure. 

(b) Atomizing media (air or steam) shall be super- 
vised by a low-pressure interlock switch to cause safety 
shutdown and lockout if atomizing media pressure falls 
below the manufacturer's design pressure. 

(c) A high oil temperature supervisory interlock 
switch shall be provided for all preheated oil systems 
to cause a safety shutdown and lockout when the oil 
temperature exceeds preset limits. 

(d) For low oil temperature supervision, an interlock 
switch shall be provided to cause safety shutdown and 
allow circulation to reestablish preset oil temperature. 

CF-460 Safety Shutoff Valves 

(a) Two approved safety shutoff valves or one safety 
shutoff valve and a nozzle cutoff valve integral to the 
fuel unit shall be provided. The safety shutoff valves 
shall conform to UL 429, Standard for Electrically 
Operated Valves. A nozzle cutoff valve integral to the 
fuel unit shall conform to UL 343, Standard for Pumps 
for Oil Burning Appliances. 

It is recommended that whenever shutoff valves can 
trap oil between two valves or between a check valve 
and safety shutoff valve, a relief valve be used to prevent 
hydraulic pressure increases in the line, as trapped oil 
absorbs heat. 



(b) A safety shutoff valve responding to pressure vari- 
ations in a hydraulic or pneumatic remote control system 
shall close upon failure of pressure in the control system. 

(c) The pressure rating of the safety shutoff valve shall 
not be less than the maximum pump pressure. 

(d) Safety shutoff valves shall have a shutoff time not 
to exceed that shown in Table CF-5. 

CF-470 Oil-Fired Boiler Units, Purging (See Table 
CF-5) 

Oil burners shall provide for purging the firebox and 
boiler passes as indicated below for the applicable input 
classification. 

(a) for boiler units that have a maximum nameplate 
fuel input rating greater than 7 gph (26.5 L/h) and less 
than or equal to 20 gph (757 L/h), and where the oil 
pump is driven independently of the burner fan motor, 
a preignition purge of no fewer than four air changes — 
either in 90 sec or at 60% damper opening with both 
damper opening and air flow proven 

Boiler units less than or equal to 5,000,000 Btu/hr 
input utilizing burners labeled and listed by a nationally 
recognized testing agency and designed with a fixed 
mechanical stop to prevent the damper from going 
below an air flow rate at least equivalent to that provided 
for combustion at 60% of the rated high- fire input are 
exempt from proving damper opening. 

(b) for boiler units that have a maximum nameplate 
fuel input rating greater than 20 gph (757 L/h) 

(1) a preignition purge of no fewer than four air 
changes at 60% damper opening with both damper 
opening and air flow proven 

(2) a postpurge of 15 sec 

Boiler units less than or equal to 5,000,000 Btu/hr 
input utilizing burners labeled and listed by a nationally 
recognized testing agency and designed with a fixed 
mechanical stop to prevent the damper from going 
below an air flow rate at least equivalent to that provided 
for combustion at 60% of the rated high-fire input are 
exempt from proving damper opening. 

CF-480 Combustion Air Proving (Refer to Table CF-5) 

Oil-fired boiler units having forced or induced draft 
fans, or both, shall comply with one of the following for 
safety shutdown and lockout, or recycle, as applicable: 

(a) Combustion air proving shall be provided for units 
having inputs greater than 3 gph (11.4 L/h) [approxi- 
mately 400,000 Btu/hr (117 228 W)] and less than or 
equal to 20 gph (757 L/h) [approximately 2,800,000 
Btu/hr (820 599 W)], if the fan is not integral with the 
burner motor shaft. 

(b) Loss of combustion air shall result in safety shut- 
down and lockout, or recycle, for units having inputs 
greater than 3 gph (11.4 L/h) [approximately 400,000 
Btu/hr (117 228 W)] and less than or equal to 20 gph 
(75.7 L/h) [approximately 2,800,000 Btu/hr (820 599 W)]. 



(09) 



25 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



(09) 



Table CF-5 Safety Controls for Automatically Fired Units: Oil-Fired Burners 



% 



3 



b ^s 



If 

*< o 

. o 



CD a 

E § 

I § 

3. SP 

If 

& 3 



I! 

o ] 

§ W 

P 






Safety Control 



Greater Than 3 gph (11.4 L/h) [approximately 400,000 Btu/hr (117 228 W)] and 
Less Than or Equal to 20 gph (75.7 L/h) [approximately 2,800,000 Btu/hr (820 599 W)] 



Greater Than 20 gph (75.7 L/h) [approximately 
2,800,000 Btu/hr (820 599 W)] 



Purge requirements 

Post purge 

Pilot type and establishing period 
Continuous 
Intermittent 
Interrupted 



When oil pump operates independently of the burner, four air changes in 90 sec or at 60% 
damper opening, with damper opening and air flow proven if total input is in excess of 7 gph 
(26.5 L/h) [approximately 1,000,000 Btu/hr (293 071 W)] [Note (1)3 

Not required 

Not permitted 
Not permitted 
10-sec maximum if pilot is used 



Main burner ignition type and estab- interrupted pilot, 15-sec maximum 
lishing period Intermittent direct ignition system, 15-sec maximum 

interrupted direct ignition system, 15-sec maximum 



Flame failure response time 



Valve closing time 

Action of flame failure 

Proven low fire start 

Combustion air proving — action on 
loss of combustion air 

Fuel pressure supervision 

Low atomizing media supervision 
Oil temperature supervision 



Intermittent direct ignition system, greater than 3 and less than or equal to 7 gph (11.4 L/h to 

26,5 L/h), 15-sec maximum 
Intermittent direct ignition system, greater than 7 and less than or equal to 20 gph (26.5 L/h to 

75.7 L/h), 4-sec maximum 
Interrupted pilot or direct ignition system, greater than 3 and less than or equal to 20 gph 

(11.4 L/h to 75.7 L/h), 4-sec maximum 

5-sec maximum after de-energization 

Safety shutdown and lockout or recycle once [Note (3)] 

Not required 

Required if fans not integral with burner motor shaft; safety shutdown and lockout or recycle 

Not required 

Required unless atomization by air pump integral with burner motor shaft [see para. CF-450(b)] 

High and low temperature supervision required on preheated oil. Excess temperature shall cause 
safety shutdown and lockout. 



Four air changes at 60% damper opening 
with both damper opening and air flow 
proven [Note (1)] 

15-sec minimum 

Not permitted 
Not permitted 
Required: 10-sec maximum 
Exception: see Note (2) 

Interrupted pilot only 

Exception: see Note (2) 

Nos. 2 and 4 oil — 10-sec maximum 

Nos. 5 and 6 oil — 15-sec maximum 

4-sec maximum 



1-sec maximum 

Safety shutdown and lockout 

See para. CF-610 

Required: safety shutdown and lockout 

Required if oil pump not integral with 
burner motor shaft (see para. CF-450) 

Required [see para. CF-450(b)] 

High and low temperature supervision 
required on preheated oil. Excess tem- 
perature shall cause safety shutdown 
and lockout. 



> 

CO 



o 

CO 

o 



© 
o 



GENERAL NOTE: Timings shown above represent the maximum primary safety control timings permitted by this Standard. The model designation of the installed primary safety control 

together with the timings shall be provided in the documentation of the burner/boiler. 

NOTES: 

(1) For dampers with a fixed mechanical stop, see paras. CF-470(a) and (b)(1). 

(2) With proven low fire start at a low fire input rate of not more than 20 gph (75.7 L/h), interrupted pilot or direct ignition system allowed. Main burner establishing period: 15-sec 
maximum 

(3) Recycle permitted when a maximum 4-sec flame failure response time is used. 



ASME CSD-1-2009 



(c) Loss of combustion air shall result in safety shut- 
down and lockout for units having inputs greater than 
20 gph (75.7 L/h) [approximately 2,800,000 Btu/hr (820 
599 W)]. 



CF-500 OIL-FIRED BOILER UNITS, SAFETY 
CONTROLS 

CF-510 Primary Safety Control 

(a) Each main burner assembly shall be equipped 
with a primary safety control that will deenergize the 
shutoff means upon loss of flame at the point of 
supervision. 

(b) The response time of the primary safety control 
to deenergize or deactivate the shutoff device shall not 
exceed the values shown in Table CF-5. 

(09) (c) Primary safety controls shall be labeled and listed 
by a nationally recognized testing agency 

(d) The main burner flame-establishing period shall 
not exceed the values shown in Table CF-5. 

(e) Primary safety controls shall require local manual 
intervention by an operator or service technician to reset. 
Devices that can electrically reset without local manual 
intervention, such as when power or control input to 
the device is interrupted and then restored, shall not be 
permitted. 

CF-520 Automatic Ignition Devices 

(a) Where automatically ignited pilots are used, the 
pilot flame shall be proved prior to energizing the main 
fuel supply means. Fuel to pilots shall be automatically 
shut off if the pilot is not proved. 

(b) The pilot type and flame-establishing period shall 
meet the provisions shown in Table CF-5. 

(c) The application of direct spark ignition systems 
is limited to boiler units having initial inputs less than 
or equal to 20 gph (757 L/h). 

(d) The fuel train to pilots shall meet the applicable 
provisions of this Standard. 

CF-530 Action on Flame Failure (Refer to Tables CF-2 
and CF-5) 

Loss of main flame shall result in safety shutdown 
for all oil-fired boiler units. In addition, oil-fired boiler 
units shall also comply with one of the following for 
relight, recycle, or lockout as applicable: 

(a) Relight, if initiated within 0.8 sec upon loss of 
flame, is permitted for units having inputs less than or 
equal to 3 gph (11.4 L/h) [approximately 400,000 Btu/hr 
(117 228 W)] and using an interrupted pilot or direct 
ignition system. 

(b) Lockout is required for units having inputs greater 
than 3 gph (11.4 L/h) [approximately 400,000 Btu/hr 
(117 228 W)] and less than or equal to 20 gph (75.7 L/h). 
However, recycle is permitted, if a maximum 4-sec flame 
failure response time is used. 



(c) Lockout is required for units having inputs greater 
than 20 gph (75.7 L/h) [approximately 2,800,000 Btu/hr 
(820 599 W)]. 



CF-600 LOW FIRE START, GAS- 
BOILER UNITS 



OR OIL-FIRED 



CF-610 Low Fire Start 

Boiler units having inputs greater than 2,500,000 
Btu/hr (732 678 W) (gas-fired) or a maximum nameplate 
fuel input rating greater than 20 gph (75.7 L/h) (oil-fired) 
shall be equipped with an interlocked damper to provide 
for low fire starts. However, boiler units that are labeled 
and listed by a nationally recognized testing agency 
shall be accepted without such interlocking controls. 

CF-700 COMBINATION GAS- AND OIL-FIRED UNITS 

CF-710 Burner Assemblies 

Burner assemblies having gas inputs greater than 
400,000 Btu/hr (117 228 W) and oil inputs that have a 
maximum nameplate fuel input rating greater than 
3 gph (11.4 L/h) shall comply with the provisions of 
Part CE Burner assemblies, as part of a boiler unit or 
separately, shall be labeled and listed by a nationally 
recognized testing agency or other certifying organiza- 
tion that is acceptable to the authority having jurisdic- 
tion as complying with 

(a) UL 795, Standard for Commercial-Industrial Gas 
Heating Equipment 

(b) UL 296, Standard for Oil Burners or UL 726, 
Standard for Oil-Fired Boiler Assemblies 

CF-800 ELECTRICALLY HEATED BOILERS 

CF-810 General 

Electrically heated boilers for steam or hot-water ser- 
vice in sizes greater than 115 kW (approximately 400,000 
Btu/hr) shall comply with the following provisions: 

(a) Electric resistance-type boilers shall be listed by a 
nationally recognized testing agency as complying with 
UL 834, Standard for Heating, Water Supply, and Power 
Boilers — Electric. 

(b) Electrode-type boilers shall be designed for single- 
phase, three-wire or three-phase, four-wire operation 
and shall conform to the requirements of NFPA 70, 
National Electrical Code. 

CF-900 COMBUSTION SIDE CONTROLS FOR 
MODULAR BOILERS 

CF-910 Gas Modular Boilers 

The modules of gas modular boilers shall comply with 
CG-140(a). 

Boiler units with field-installed gas burner assemblies 
and boiler units that do not comply with ANSI Z21.13/ 



(09) 



(09) 



(09) 



27 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



CSA 4.9 shall comply with the provisions for purging, Boiler units with field-installed oil burner assemblies 

safety control timing, action on flame failure, loss of and boiler units that do not comply with UL 726 shall 
combustion air, combustion air proving, and fuel super- comply with the provisions for purging, safety control 
vision given in Table CF-1 or CF-2, as applicable. timing, action on flame failure, loss of combustion air, 

combustion air proving, and fuel supervision given in 



(09) CF-920 Oil Modular Boilers 



Table CF-5. 

CF-930 Electric Modular Boilers (09) 

The modules of oil modular boilers shall comply with The modules of electric modular boilers shall comply 

CG-140(b). with CG-140(c). 



28 



Copyright © 2009 by the American Society of Mechanical Engineers. A^ s . 

No reproduction may be made of this material without written consent of ASME. * 



ASME CSD-1-2009 



NONMANDATORY APPENDIX A 
COMPARISON OF THIS STANDARD AND ANSI Z21.13/CSA 4.9 



Where permitted in CSD-1, boilers listed and labeled 
as in compliance with ANSI Z21.13/CSA 4.9 meet the 
requirements of this Standard when additional trim 
equipment is installed. 

ANSI Z21.13/CSA 4.9 is a performance-based stan- 
dard for gas-fired, low-pressure steam and hot water 
boilers that requires testing and design certification of 
boiler burner units by an approved testing laboratory. 
One of the major differences between the two standards 
is the automatic ignition, maximum safety control tim- 
ing table. The ignition timing table as shown in Z21.13/ 
CSA 4.9 reflects a wide range of ignition controls and 
timing sequences. This permits the greatest flexibility 
in design parameters; however, all boiler burner units 
must comply with the performance tests to obtain certifi- 
cation. These performance tests include testing under 
normal and abnormal operating conditions (e.g., 
delayed ignition, temperature ranges, voltage variations, 
etc.). As a result, most boiler burner units listed as in 
compliance with Z21.13/CSA 4.9 generally have shorter 
ignition timings than the maximum times allowed by 
Z21.13/CSA 4.9. All boiler burner units listed and 



labeled under Z21.13/CSA 4.9 must be accompanied 
with installation instructions referring the installer to 
CSD-1 where jurisdictions require that the installation 
conform to this Standard. The instructional require- 
ments of Z21.13/CSA 4,9 are a mandatory part of the 
standard. 

CSD-1 is a design-based standard for controls and 
safety devices for automatically fired boilers, which 
includes high- and low-pressure boilers that are gas, oil, 
or electrically fired. The automatic ignition, maximum 
safety control timings are generally shorter, as no labora- 
tory certification testing of the boiler unit is required. 
CSD-1 requires the manufacturers of controls and safety 
devices to provide detailed instructions for testing, 
maintenance, and service procedures of controls and 
safety devices installed on boiler units covered by this 
Standard. CSD-1 requires the operation of control sys- 
tems and safety devices be tested by the installing con- 
tractor prior to release to the owner /user. All controls 
and safety devices covered by CSD-1 must be accepted 
and listed for the intended service by a nationally recog- 
nized testing agency, such as, but not limited to, CSA, 
FM, or UL. 



29 



Copyright © 2009 by the American Society of Mechanical Engineers. £@ 

No reproduction may be made of this material without written consent of ASME. *2 



ASME CSD-1-2009 



NONMANDATORY APPENDIX B 
TYPICAL FUEL TRAINS 



Fig. B-l Typical Atmospheric Gas Fuel Train [Greater Than 400,000 Btu/hr (117 228 W) 
and Less Than or Equal to 2,500,000 Btu/hr (732 678 W)] 



To atmosphere 



Gas input 
V 



*> 



-^ 



M 
J 
Sediment trap 



A 

HXh 



S — L_^>^ 



J 

-txy 



M 
-J Test 



M 



S 



4X1 ^ Test 



A 



[Note(1)]p 



To atmosphere 

V s 

p c 

—oh 1 1 



A 

-CXh 



v^- 



TTT T 



M 

-] 



Y 

To atmospheric 
burner tubes 



To pilot burner 



M = pipe cap 

R = pressure regulator 

S = safety shutoff valve 

T = safety shutoff valve with proof of closure 



A = manual valve 

C = orifice 

F = gas filter or strainer (if required) 

G — relief valve (if required) 

I = leakage test valve 

GENERAL NOTE: Since boiler design may vary, ANSI Z21.13/CSA 4.9, Gas-Fired, Low-Pressure Steam and Hot Water Boilers, does not contain 

a typical fuel train; however, through laboratory testing procedures, ANSI Z21.13/CSA 4.9 does determine that safe lighting of the boiler will 

be accomplished. This Standard illustrates a typical fuel train for boilers. The specific fuel train diagram for boilers complying with ANSI 

Z21.13/CSA 4.9 is supplied in the boiler manufacturer's instructions. 

NOTE: 

(1) Alternate arrangement — T may be used in place of two S-type valves. 



30 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



Fig. B-2 Typical Gas Fuel Train [Greater Than 400,000 Btu/hr (117 228 W) 
and Less Than or Equal to 2,500,000 Btu/hr (732 678 W)] 



Gas input 
V 



F 
-k- — H 



M 

I I 

Sediment trap 



A 

4Xh 



To atmosphere M 

G / J -.Test 



#' 



S — ^Xr-^>G 



[Note (1)]n 

dB- 



A 



i — s ^ 



To atmosphere 
/ 



J 

-ixh 



M 
-] Test 



A 

-tXh 



-►To main burner 



-► To pilot burner 



Gas input 
V 



G To atmosphere 



^r 



M 

I I 

Sediment trap 



A 



M 



J Test M 

rXh\ J - Test 



w 



[Note (2)] f 



! T R<[ 



S S R, 



A 

-Xi- 



-P<h-+ 



To main burner 



[Note (3)] 



[Note (3)] 



A 

HxJ- 



G To atmosphere 



*2 tf S 

i — >< ' — m — I 



-> To pilot burner 



*2 

5 

T 
V 



pilot gas pressure regulator 

safety shutoff valve 

safety shutoff valve with proof of closure 

main gas pressure regulator/safety 

shutoff combination valve 

main gas pressure regulator/safety 

shutoff combination valve with 

proof of closure 



A = manual valve 

B = firing rate valve 

C = orifice 

F = gas filter or strainer (if required) 

G = relief valve (if required) 

7 = leakage test valve W 

M = pipe cap 

/? 2 = main gas pressure regulator 

GENERAL NOTE: Since boiler design may vary, ANSI Z21.13/CSA 4.9, Gas-Fired, Low-Pressure Steam and Hot Water Boilers, does not contain 
a typical fuel train; however, through laboratory testing procedures, ANSI Z21.13/CSA 4.9 does determine that safe lighting of the boiler will 
be accomplished. This Standard illustrates a typical fuel train for boilers. The specific fuel train diagram for boilers complying with ANSI 
Z21.13/CSA 4.9 is supplied in the boiler manufacturer's instructions. 
NOTES: 

(1) Alternate arrangement — Tmay be used in place of two 5-type valves. 

(2) Alternate arrangement — W may be used in place of an 5- and V-type valve. 

(3) Alternate arrangement — R x may be downstream of two 5-type valves or a T-type valve. 



31 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



Fig. B-3 Typical Gas Fuel Train [Greater Than 400,000 Btu/hr (117 228 W) 
and Less Than or Equal to 2,500,000 Btu/hr (732 678 W)] Direct Ignition System 



Gas input 
V 



M 



Sediment trap 



G To atmosphere 



«i 



F A ^ 

^ — x — th- 



-I 1 0<}-J X-T 



M 
J Test M 

^ ] A-] Te " 



[Note(1)]n 

— -oG- 



■*^ 



-0<] L— ► To main 



burner 



Gas input 
V 

F 

M 
_J 
Sediment trap 



G To atmosphere 






M 
J Test M 

JVUl J Test 



n s -" v 

-I — i — 0<1— I OKH 



[Note(2)]pD ] 
JJ- — -j 

s s f?i ! 

t>5--x--i><}-! 

r ^ 



■^ J - 



HX I ' ► 



To main 
burner 



[Note (3)] 



[Note (3)] 



A = manual valve /?i 

5 = firing rate valve R 2 

C = orifice S 

= high gas pressure switch 7 

E = low gas pressure switch V 

F = gas filter or strainer (if required) 

G = relief valve (if required) W 

J = leakage test valve 

M = pipe cap 



main gas pressure regulator 

pilot gas pressure regulator 

safety shutoff valve 

safety shutoff valve with proof of closure 

main gas pressure regulator/safety 

shutoff combination valve 

main gas pressure regulator/safety 

shutoff combination valve with 

proof of closure 



GENERAL NOTE: Since boiler design may vary, ANSI Z21.13/CSA 4.9, Gas-Fired, Low-Pressure Steam and Hot Water Boilers, does not contain 
a typical fuel train; however, through laboratory testing procedures, ANSI Z21.13/CSA 4.9 does determine that safe lighting of the boiler will 
be accomplished. This Standard illustrates a typical fuel train for boilers. The specific fuel train diagram for boilers complying with ANSI 
Z21.13/CSA 4.9 is supplied in the boiler manufacturer's instructions. 
NOTES: 

(1) Alternate arrangement — T may be used in place of two 5-type valves. 

(2) Alternate arrangement — W may be used in place of an S- and \Atype valve. 

(3) Alternate arrangement - /? a may be downstream of two S-type valves or a f-type valve. 



32 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



Fig. B-4 Typical Gas Fuel Train [Greater Than 2,500,000 Btu/hr (732 678 W) 
and Less Than or Equal to 5,000,000 Btu/hr (1 465 356 W)] 



Gas input 
V 



-^r 



M 

I I 

Sediment trap 



G To atmosphere 



R 2 



A 

L -txy 



M 
J Test M 

p-Tx^CI J Test 

s 



-J rJJ- I tA 

Din 



[Notedllr 



G Jo atmosphere 



^ 



WJ— ► 



To main 
burner 



kE Ml 

{X] ►Topi 



lot burner 



Gas input 
V 

F 

M 
Sediment trap 



G To atmosphere 



A 

-txh 



M 
J Test M 

r-fxJ J Test 

s r^J v fix-] 



-J — i — cfi-J 0<h 



[Note (2)] rpW J 

— tB-— -■( 

S S R) 

i~i>S-h>5— ffi- 

— 1>5— ><— 



"^ 



-ffi ■ » 



To main 
burner 



[Note (3)] 



[Note (3)] 



A 



G To atmosphere 



i — Si ' — iM — I 



-► To pilot burner 



A 
B 
C 
D 
E 
F 



manual valve 

firing rate valve 

orifice 

high gas pressure switch 

low gas pressure switch 

gas filter or strainer (if required) 



G 

J 

M 

s 



relief valve (if required) 

leakage test valve 

pipe cap 

main gas pressure regulator 

pilot gas pressure regulator 

safety shutoff valve 



T = 



V = 



W = 



safety shutoff valve with proof of 

closure 

main gas pressure regulator/safety 

shutoff combination valve 

main gas pressure regulator/safety 

shutoff combination valve with 

proof of closure 

GENERAL NOTE: Since boiler design may vary, ANSI Z21.13/CSA 4.9, Gas-Fired, Low-Pressure Steam and Hot Water Boilers, does not contain 
a typical fuel train; however, through laboratory testing procedures, ANSI Z21.13/CSA 4.9 does determine that safe lighting of the boiler will 
be accomplished. This Standard illustrates a typical fuel train for boilers. The specific fuel train diagram for boilers complying with ANSI 
Z21.13/CSA 4.9 is supplied in the boiler manufacturer's instructions. 
NOTES: 

(1) Alternate arrangement — 7" may be used in place of two S-type valves. 

(2) Alternate arrangement — W may be used in place of an 5- and l/-type valve. 

(3) Alternate arrangement — £ a may be downstream of two S-type valves or a f-type valve. 



33 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



Fig. B-5 Typical Gas Fuel Train [Greater Than 5,000,000 Btu/hr (1 465 356 W) 
and Less Than 12,500,000 Btu/hr (3 663 389 W)] 



Gas input 
V 



"^ 



M 
J 
Sediment trap 



q To atmosphere 



& 



F A C± 



I 



iXh 



M 

J TeSt M 

~ IX3~ll J Test 



-t>ki- 



A 

HX3- 



To atmosphere 

g.V s 

c 



i — m— L-tk- 



D 

b n 



-tXf- 



-►To main 
burner 



-> To pilot burner 



Gas input 
V 



^ 



M 
J 
Sediment trap 



q To atmosphere 

^ J Test 



F A 

— {x3- 



Li 



HXH] 



w 



ST/?! 

^ — -oG — t>G — [><i — j 



M 
J Test 

A 

xy 



D 

D 



-►To main 
burner 



[Noted)] 



To atmosphere 

c 



I IX] — ^-t>5- 



A 

Hxh 

/A = manual valve 

B = firing rate valve 

C = orifice 

D = high gas pressure switch 

E = low gas pressure switch 

F = gas filter or strainer (if required) 

G = relief valve (if required) 

} - leakage test valve 



► To pilot burner 

M = pipe cap 

R 1 = main gas pressure regulator 
R 2 = pilot gas pressure regulator 
S = safety shutoff valve 
T = safety shutoff valve with proof of closure 
1/1/ = main gas pressure regulator/safety 

shutoff combination valve with proof 

of closure 



GENERAL NOTE: Since boiler design may vary, ANSI Z21.13/CSA 4.9, Gas-Fired, Low-Pressure Steam and 

Hot Water Boilers, does not contain a typical fuel train; however, through laboratory testing procedures, 

ANSI Z21.13/CSA 4.9 does determine that safe lighting of the boiler will be accomplished. This Standard 

illustrates a typical fuel train for boilers. The specific fuel train diagram for boilers complying with ANSI 

Z21.13/CSA 4.9 is supplied in the boiler manufacturer's instructions. 

NOTE: 

(1) Alternate arrangement — R 1 may be downstream of an S- and 7"-type valve. 



34 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



Fig. B-6 Typical Oil Fuel Train 



Oil supply 
connection 

► 




^-m — m 



Atomizer 



1ZP 



u - Atomizing media supply 
{if required) 



Oil return 
connection 



P = fuel pump 

R = shutoff valve and/or pressure relief valve 

S = fuel strainer 

T - oil temperature interlock switch (if required) 

U = oil pressure interlock switch (if required) 

V = safety shutoff valve 

W = safety shutoff valve (may be three-way for recirculation) 

Y = atomizing media supply pressure interlock switch (if required) 



35 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



NONMANDATORY APPENDIX C 
MANUFACTURERS/INSTALLING CONTRACTORS REPORT FOR 

ASME CSD-1 



(09) 



Certification and Reporting (CG-500) for Controls and Safety Devices 

(This Form is a guideline and not part of ASME CSD-1-2009.) 



Unit Manufacturer 

Name 



Address . 



Telephone . 



Unit Identification (Boiler) 

Manufacturer's Model # 

ASME Section i 

UL# 



Jurisdiction . 



.Section IV . 



Zip. 



Fax_ 



Year Built _ 
Nat. Bd. #. 
CSA# 



Steam 

Maximum W.P. . 



Minimum Safety Valve Cap. 



Boiler Unit Description (type) . 
If Modular (no. of modules) _ 
Boiler Unit Capacity (output) _ 



Burner 

Manufacturer . 
UL orCSA#_ 



Fuels (as shipped) . 



Gas Manifold Pressure 

Oil Nozzle/Delivery Pressure (at maximum input) 

High Gas Pressure Switch Setting 

Low Oil Pressure Switch Setting 

Installation Location (if known) 

Customer Name 



Address. 
City 



Telephone . 



Hot Water 

_psig Maximum W.P. _ 
_PPH Maximum Temp. 



-psig 

°F 



Minimum Safety Relief Valve Cap. 



_PPH or Btu 



Model . 



Serial #. 



Indicate Units (where not applicable, indicate "N/A") 



State . 
Fax 



Zip. 



36 



Copyright © 2009 by the American Society of Mechanical Engineers. £<£. 

No reproduction may be made of this material without written consent of ASME. ^^ 



ASME CSD-1-2009 



Certification and Reporting (CG-500) for Controls and Safety Devices (Cont'd) 

(This Form is a guideline and not part of ASME CSD-1-2009.) 

Operational Test 
Control/Device Manufacturer Model # Performed, Date 

Operating Controls 

Low-Water Fuel Cutoff 

CW420(a), CW-140 . 

Forced Circulation 

CW-210(a) 

Steam Pressure 

CW-310(b) 

Water Temperature 

CW-4 10(b) 



Safety Controls 

Low-Water Fuel Cutoff 

CW-120(a), CW-1 20(b) 

CW-130, CW-140 
Forced Circulation 

CW-2 10(b) 
High Steam Pressure Limit 

CW-3 10(c) 
High Water Temperature Limit 

CW-410(b) 
Fuel Safety Shutoff Valve, Main 

CF-180(b)(2), CF-180(b)(3) 
Pilot Safety Shutoff Valve 

CF-1 80(c) 
Atomizing Medium Switch 

CF-450(b) 
Combustion Air Switch 

CF-220 
High Gas Pressure 

CF-162 
Low Gas Pressure 

CF-162 
Low Oil Pressure 

CF-450(a) 
High Oil Temperature 

CF-450(c) 
Low Oil Temperature 

CF-450(d) 
Purge Air Flow 

CF-210 
Flame Safeguard (Primary) 

CF-310, CF-320 
Flame Detector 

CF-310, CF-320 

Low Fire Start 

Low-Fire Start Switch 
CF-610 

Safety or Safety Relief Valve(s) 
CW-510, CW-520 



37 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME C5D-1-2009 



Certification and Reporting (C6-500) for Controls and Safety Devices (Cont'd) 
(This Form is a guideline and not part of ASME CSD-1-2009.) 



Manufacturer Operational Test Performed, Date . 

Model 

Size 



Capacity _ PPH/Btu/hr 



Representing Equipment Manufacturer, Name . 



Signature Date . 



Representing Installing Contractor, Name . 



Signature Date. 



38 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



NONMANDATORY APPENDIX D 
RECOMMENDED PREVENTIVE MAINTENANCE SCHEDULE 

(Operation and maintenance instructions in this safety standard are intended for general applications. For specific operating and 
maintenance instructions, consult the equipment manufacturer.) 



D-l DAILY 

(a) Check gages, monitors, and indicators. 

(b) Check instrument and equipment settings. 

(c) For high-pressure boilers, test low-water fuel cut- 
off device and alarm. 

(d) Check burner flame. 

D-2 WEEKLY 

(a) For low-pressure boilers, test low-water fuel cut- 
off device and alarm. 

(b) Check igniter. 

(c) Check flame signal strength. 

(d) Check flame failure detection system. 

(e) Check firing rate control. 

(f) Make aural and visual check of pilot and main 
fuel valves. 

D-3 MONTHLY 

(a) Check flue, vent, stack, or outlet dampers. 

(b) Test low draft, fan air pressure, and damper posi- 
tion interlocks. 

(c) Check low-fire start interlock. 

(d) Test high and low oil pressure and temperature 
interlocks. 

(e) Test high and low gas pressure interlocks. 

D-4 SEMI-ANNUALLY 

(a) Recalibrate all indicating and recording gages. 

(b) For steam boilers, perform a slow drain test of the 
low- water fuel cut-off device. 

(c) Check flame failure detection system components. 
id) Check firing rate control. 

(e) Check piping and wiring of all interlocks and shut- 
off valves. 

(f) Inspect burner components. 

D-5 ANNUALLY 

(a) Flame failure detection system, pilot turndown 
test. 



(b) Flame failure detection system, test for hot refrac- 
tory hold in. 

(c) Check dual fuel change over control. 

(d) Test high-limit and operating temperature or 
steam pressure controls. 

(e) Replace vacuum tubes, scanners, or flame rods in 
accordance with manufacturer's instructions. 

(f) Conduct a combustion test. 

(g) Check all coils and diaphragms; test other 
operating parts of all safety shutoff and control valves. 

(h) Test fuel valve interlock switch in accordance with 
manufacturer's instructions. 

(i) Perform leakage test on pilot and main gas and /or 
oil fuel valves. 

(j) Test purge air switch in accordance with manufac- 
turer's instructions. 

(k) Test air/ steam interlock in accordance with manu- 
facturer's instructions. 

(I) Test burner position interlock in accordance with 
manufacturer's instructions. 

(m) Test rotary cup interlock in accordance with man- 
ufacturer's instructions. 

(n) Test low-fire start interlock in accordance with 
manufacturer's instructions. 



D-6 AS REQUIRED 

(a) Recondition or replace low-water fuel cut-off 
device. 

(b) For oil-fired burners, clean atomizers and oil 
strainers. 

(c) For gas-fired burners, check sediment trap and gas 
strainers. 

(d) Flame failure detection system, pilot turndown 
test. 

(e) Flame failure detection system, test for hot refrac- 
tory hold in. 

(f) Test safety /safety relief valves in accordance with 
ASME Boiler and Pressure Vessel Code, Sections VI 
and VII. 



39 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



Table D-l Periodic Testing Recommended Checklist (See Manufacturer's Instructions) 



Frequency [Note (1)] 



Accomplished By 



2 
o 

3 ■% 

§ s 

B © 

V! o 

. O 
VO 



§* 






1 8 

3. o 
S* ° 

& © 






03 



D 


w 


M 


S/A 


A 


A/R 


Component/Item 


Recommended Test 


Operator 


Technician 


X 






X 






Gages, monitors, and indicators 
Gages, monitors, and indicators 


Make visual inspection and record readings in boiler log. 
Recalibrate all indicating and recording gages. 


X 


X 


X 












Instrument and equipment set- 
tings 


Make visual check against factory-recommended specifica- 
tions. 


X 




X 


X 


X 


X 


X 


X 
X 


Low-water fuel cut-off device 
(high-pressure boilers) 

Low-water fuel cut-off device (low- 
pressure boilers) 

Low-water fuel cut-off device 
(steam boilers) 

Low-water fuel cut-off device 

Operating and/or limit controls 

Safety/safety relief valves 

Flue, vent, stack, or outlet 
dampers 


Test low-water fuel cut-off device according to manufacturer's 
instructions. 

Test low-water fuel cut-off device according to manufacturer's 
instructions. 

For steam boilers, perform a slow drain test in accordance 
with ASME Boiler and Pressure Vessel Code, Section VI. 

Recondition or replace low-water fuel cut-off device. 

Test high-limit and operating temperature or steam pressure 
controls. 

Test safety/safety relief valves in accordance with ASME 
Boiler and Pressure Vessel Code, Sections VI and VII. 

Make visual inspection of linkage, and check for proper oper- 
ation. 


X 
X 

X 


X 

X 
X 

X 


X 


X 
X 

X 










Burner flame 
Igniter 

Flame signal strength 

Flame failure detection system 


Make visual inspection of burner flame [Note (2)]. 

Make visual inspection, and check flame signal strength if 

meter-fitted. 

If flame signal meter is installed, read and tog. For both pilot 
and main flames, notify service organization if readings are 
very high, very low, or fluctuating (refer to manufacturer's 
instructions). 

Close manual fuel supply for (1) pilot, (2) main fuel cock, 
and/or (3) vaive(s). Check safety shutdown timing, and 
log. 


X 
X 

X 
X 





> 

m 
o 
O 



o 
© 



Table D-l Periodic Testing Recommended Checklist (Cont'd) 



Frequency [Note (1)] 



Accomplished By 



% 


o 




►3 p 


Hi O 


o ►d 


P* *< 


£ h1. 


n 


B © 


JM tsJ 


^ O 


srs 


5T 


03 r+ 


tl 


en 2. 


1 8 


2 05 


P. o 


&L Q. 




& o 


O ^5 


a s 


< n> 


S o 


9. tr* 


P* E 


8 1- 


O ga 


o ^ 


P ffl 


« eg 


p B' 




O CD 


t-h CD 
[> on 


05 




(b^w 


, «^y^ j 



D 


W 


M 


S/A 


A 


A/R 


Component/Item 


Recommended Test 


Operator 


Technician 








X 


X 




Flame failure detection system 
Flame failure detection system 


Check flame failure detection system components, such as 
vacuum tubes, amplifier, and relays. 

Replace vacuum tubes, scanners, or flame rods in accor- 
dance with manufacturer's instructions. 




X 
X 










X 


X 


Flame failure detection system 
(pilot turndown test) 


Conduct pilot turndown test according to manufacturer's 
instructions. This test is required annually and after any 
adjustments to flame scanner mount or pilot burner. 




X 










X 


X 


Flame failure detection system 
(hot refractory hold in test) 


Test for hot refractory hold in. This test is required annually 
and after any adjustments to the flame scanner mount or 
pilot burner. 




X 




X 




X 


X 




Firing rate control 
Firing rate control 
Firing rate control 


Check firing rate control, and verify factory settings (refer to 
manufacturer's instructions). 

Check firing rate control, and verify factory settings (refer to 
manufacturer's instructions). 

Conduct a combustion test, and verify settings are in accor- 
dance with manufacturer's instructions. 


X 


X 
X 




X 


X 




X 
X 
X 

X 




Pilot and/or main fuel valves 

Pilot and/or main fuel valves 

Pilot and/or main fuel valves 

Pilot and/or main fuel valves 

Low draft, fan, air pressure, and 
damper position interlocks 

Low draft, fan, air pressure, and 
damper position interlocks 


Open limit switch, and make aural and visual check. Check 
valve position indicators, and check fuel meters if so fit- 
ted. 

Check all coils and diaphragms. Test other operating parts of 
all safety shutoff and control valves. 

Test fuel valve interlock switch in accordance with manufac- 
turer's instructions. 

Perform leakage test on pilot and main gas and/or oil fuel 
valves, in accordance with manufacturer's instructions. 

Test low draft, fan, air pressure, and damper position inter- 
locks according to manufacturer's instructions. 

Test purge switch in accordance with manufacturer's instruc- 
tions. 


X 
X 


X 
X 
X 

X 



> 

Cft 

2 






Table D-l Periodic Testing Recommended Checklist (Cont'd) 



►3 n 
o xi 

|f 

B © 

P to 
v; o 



£ o 
o **i 



I. 



g g 1 



£> zn 

XA 



4^ 



Accomplished By 



Frequency [Note (1)] 



W M S/A 



A/R 



Component/Item 



Recommended Test 



Boiler Service 

Operator Technician 







X 




X 




Low-fire start interlock 
Low-fire start interlock 


Check low-fire start interlock according to manufacturer's 
instructions. 

Test low-fire start interlock in accordance with manufacturer's 
instructions. 


X 


X 






X 








Oil pressure and temperature 
interlocks 


Test high and low oil pressure and temperature interlocks 
according to manufacturer's instructions. 


X 








X 


X 
X 


X 
X 
X 




Gas pressure interlocks 

Interlocks and valves 
Atomizing air/steam interlock 

Burner position interlock 

Rotary cup burner interlock 

Burner components 


Test high and low gas pressure interlocks according to manu- 
facturer's instructions. 

Check piping and wiring of all interlocks, and shutoff valves. 

Test air/steam interlock in accordance with manufacturer's 
instructions. 

Test burner position interlock in accordance with manufactur- 
er's instructions. 

Test rotary cup interlock in accordance with manufacturer's 
instructions. 

Inspect burner components according to manufacturer's 
instructions. 


X 


X 
X 

X 

X 

X 










X 


X 

X 
X 


Burner components 

Burner components 
Burner components 


Check dual fuel change over control. If automatically con- 
trolled by gas utility, perform test under the supervision of 
gas utility. 

For oil-fired burners, clean atomizers and oil strainers. 

For gas-fired burners, check sediment trap and gas strainer. 




X 

X 
X 



NOTES: 

(1) D, daily; W, weekly; M, monthly; S/A, semi-annually; A, annually; A/R, as-required. 

(2) Caution should be used when viewing burner flame. Personal protective equipment, such as filtered eyeware, may be necessary. 



> 

m 

D 
in 
o 



ASME CSD-1-2009 



NONMANDATORY APPENDIX E 
REFERENCES 



The following is a list of standards referenced in this 
Standard. 

ANSI Z21.13-2005/CSA 4.9-2005, Gas-Fired, Low- 
Pressure Steam and Hot Water Boilers 1 

ANSI Z21.17-1998/CSA 2.7-M98, Domestic Gas 
Conversion Burners 1 

ANSI Z21.18-2000/CSA 6.3-2000, Gas Appliance 
Pressure Regulators (including all addenda issued) 1 

ANSI Z21.21-2005/CSA 6.5-2005, Automatic Valves for 
Gas Appliances 1 

ANSI Z21.22-1999 (R2004)/CSA 4.4-M99, Relief Valves 
for Hot Water Supply Systems 1 

ANSI Z21.56-2001/CSA 4.7-2001, Gas-Fired Pool 
Heaters (including all addenda issued) 1 

ANSI Z21.78-2005/CSA 6.20-2005, Combination Gas 
Controls for Gas Appliances 1 

Publisher: CSA International, 8501 East Pleasant Valley 
Road, Cleveland, OH 44131 

2007 ASME Boiler and Pressure Vessel Code (including 

all addenda issued) 
Publisher: The American Society of Mechanical 

Engineers (ASME), Three Park Avenue, New York, 

NY 10016-5990; Order Department: 22 Law Drive, Box 

2300, Fairfield, NJ 07007-2300 

ASTM D 396-02, Standard Specification for Fuel Oils 



1 May also be obtained from the American National Standards 
Institute (ANSI), 25 West 43rd Street, New York, NY 10036. 



Publisher: American Society for Testing and Materials 
(ASTM International), 100 Barr Harbor Drive, P.O. Box 
C700, West Conshohocken, PA 19428-2959 

NFPA 31-2001, Standard for the Installation of 

Oil-Burning Equipment 
NFPA 54/ANSI Z223.1-2006, National Fuel Gas Code 1 
NFPA 58-2004, Liquefied Petroleum Gas Code 
NFPA 70-2005, National Electrical Code 
NFPA 85-2004, Boiler and Combustion Systems 

Hazards Code 

Publisher: National Fire Protection Association (NFPA), 
1 Batterymarch Park, Quincy, MA 02169-7471 

UL 144-1999, Standard for LP-Gas Regulators 

UL 296-2003, Standard for Oil Burners 

UL 343-1997, Standard for Pumps for Oil-Burning 

Appliances 
UL 353-1994, Standard for Limit Controls 
UL 429-1999, Standard for Electrically Operated Valves 
UL 506-2000, Standard for Specialty Transformers 
UL 726-1995, Standard for Oil-Fired Boiler Assemblies 
UL 795-1999, Standard for Commercial-Industrial Gas 

Heating Equipment 
UL 814-2004, Gas-Tube-Sign Cable 
UL 834-2004, Standard for Heating, Water Supply, and 

Power Boilers — Electric 

Publisher: Underwriters Laboratories, Inc. (UL), 333 
Pfingsten Road, Northbrook, IL 60062-2096 



43 



Copyright © 2009 by the American Society of Mechanical Engineers. ^g£| 

No reproduction may be made of this material without written consent of ASME. ^^ 



ASME CSD-1-2009 



09) NONMANDATORY APPENDIX F 

GUIDANCE FOR THE USE OF U.S. CUSTOMARY AND SI UNITS 

IN CSD-1 



F-l USE OF UNITS IN EQUATIONS 

It is the responsibility of the individual and organiza- 
tion performing calculations to ensure that appropriate 
units are used. Either U.S. Customary or SI 1 units may 
be used as a consistent set. When necessary to convert 
from one system of units to another, the units shall be 
converted to at least three significant figures for use in 
calculations and other aspects of construction. 

F-2 GUIDELINES USED TO DEVELOP SI 
EQUIVALENTS 

The following guidelines were used to develop SI 
equivalents: 

(a) SI units are placed in parentheses after the U.S. 
Customary units in the text. 

(b) In general, separate SI tables are provided if inter- 
polation is expected. The table designation (e.g., table 
number) is the same for both the U.S. Customary and 
SI tables, with the addition of suffix "M" to the designa- 
tor for the SI table, if a separate table is provided. In 
the text, references to a table use only the primary table 
number (i.e., without the "M"). For some small tables, 
where interpolation is not required, SI units are placed 
in parentheses after the U.S. Customary unit. 

(c) Separate SI versions of graphical information 
(charts) are provided, except that if both axes are dimen- 
sionless, a single figure (chart) is used. 

(d) In most cases, conversions of units in the text were 
done using hard SI conversion practices, with some soft 
conversions on a case-by-case basis, as appropriate. This 
was implemented by rounding the SI values to the num- 
ber of significant figures of implied precision in the 
existing U.S. Customary units. For example, 3,000 psi 
has an implied precision of one significant figure. There- 
fore, the conversion to SI units would typically be to 
20 000 kPa. This is a difference of about 3% from the 
"exact" or soft conversion of 20 684.27 kPa. However, 



1 The International System of Units, universally abbreviated SI 
(from the French Le Systeme International d'Unites), is the modern 
metric system of measurement. The SI was established in 1960 by 
the 11th General Conference on Weights and Measures (CGPM, 
Conference Generate des Poids et Mesures). The CGPM is the interna- 
tional authority that ensures wide dissemination of the SI and 
modifies the SI as necessary to reflect the latest advances in science 
and technology 



the precision of the conversion was determined by the 
committee on a case-by-case basis. More significant dig- 
its were included in the SI equivalent if there was any 
question. 

(e) Minimum thickness and radius values that are 
expressed in fractions of an inch were generally con- 
verted according to the following table: 

Proposed 
Fraction, in. SI Conversion, mm Difference, % 



hi 


0.8 


-0.8 


3 / 
/<54 


1.2 


-0.8 


V,6 


1.5 


5.5 


3 / 

'32 


2.5 


-5.0 


\ 


3 


55 


5 / 
'32 


4 


-0.8 


\ 


5 


-5.0 


%2 


5.5 


1.0 


\ 


6 


55 


%e 


8 


-0.8 


% 


10 


-5.0 


\, 


11 


1.0 


\ 


13 


-2.4 


X 


14 


2.0 


5 / 
/8 


16 


-0.8 


% 


17 


2.6 


% 


19 


0.3 


% 


22 


1.0 


1 


25 


1.6 



(f) For nominal sizes that are in even increments of 
inches, even multiples of 25 mm were generally used. 
Intermediate values were interpolated, rather than con- 
verting and rounding to the nearest millimeter. See 
examples in the following table [Note that this table 
does not apply to nominal pipe sizes (NPS), which are 
covered below.]: 

Size, in. Size, mm 



1 


25 


1V 8 


29 


1% 


32 


\\ 


38 


2 


50 


2% 


57 


2\ 


64 


3 


75 


3V 2 


89 


4 


100 


4V 2 


114 


5 


125 


6 


150 


8 


200 



44 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



Size, in. 


Size, mm 


12 


300 


18 


450 


20 


500 


24 


600 


36 


900 


40 


1000 


54 


1350 


60 


1500 


72 


1800 


Size of Length, ft 


Size of Length, m 


3 


1 


5 


1.5 


200 


60 



(g) For nominal pipe sizes, the following relationships 
were used: 



(i) Volumes in cubic inches (in. 3 ) were converted to 
cubic millimeters (mm 3 ), and volumes in cubic feet (ft 3 ) 
were converted to cubic meters (m 3 ). See examples in 
the following table: 



Volume (U.S. Customary) 


Volume (SI) 


1 in. 3 


16 000 mm 3 


6 in. 3 


100 000 mm 3 


10 in. 3 


160 000 mm 3 


5 ft 3 


0.14 m 3 



(j) Although the pressure should always be in MPa 
for calculations, there are cases where other units are 
used in the text. For example, kPa is used for small 
pressures. Also, rounding was to one significant figure 
(two at the most) in most cases. See examples in the 
following table (Note that 14.7 psi converts to 101 kPa, 
while 15 psi converts to 100 kPa. While this may seem 
at first glance to be an anomaly, it is consistent with the 
rounding philosophy): 



U.S. 




U.S. 




Customary 




Customary 




Practice 


SI Practice 


Practice 


SI Practice 


NPS V 8 


DN6 


NPS 20 


DN500 


NPS V 4 


DN8 


NPS 22 


DN550 


NPS % 


DN10 


NPS 24 


DN600 


NPS \ 


DN15 


NPS 26 


DN650 


NPS \ 


DN20 


NPS 28 


DN700 


NPS1 


DN25 


NPS 30 


DN750 


NPS lV 4 


DN32 


NPS 32 


DN800 


NPS lV 2 


DN40 


NPS 34 


DN850 


NPS 2 


DN50 


NPS 36 


DN900 


NPS 2V 2 


DN65 


NPS 38 


DN950 


NPS 3 


DN80 


NPS 40 


DN 1000 


NPS 3V 2 


DN90 


NPS 42 


DN 1050 


NPS 4 


DN100 


NPS 44 


DN 1100 


NPS 5 


DN125 


NPS 46 


DN 1150 


NPS 6 


DN150 


NPS 48 


DN 1200 


NPS 8 


DN200 


NPS 50 


DN 1250 


NPS 10 


DN250 


NPS 52 


DN 1300 


NPS 12 


DN 300 


NPS 54 


DN 1350 


NPS 14 


DN350 


NPS 56 


DN 1400 


NPS 16 


DN400 


NPS 58 


DN 1450 


NPS 18 


DN450 


NPS 60 


DN 1500 



(h) Areas in square inches (in. 2 ) were converted to 
square millimeters (mm 2 ), and areas in square feet (ft 2 ) 
were converted to square meters (m 2 ). See examples in 
the following table: 



Area (U.S. Customary) 



1 in/ 



6 in/ 
10 in. 2 

5 ft 2 



Area (SI) 

650 mm 2 
4 000 mm 2 
6 500 mm 2 

0.5 m 2 



Pressure (U.S. Customary) 

0.5 psi 

2 psi 

3 psi 
10 psi 

14.7 psi 

15 psi 

30 psi 

50 psi 

100 psi 

150 psi 

200 psi 

250 psi 

300 psi 

350 psi 

400 psi 

500 psi 

600 psi 
1,200 psi 
1,500 psi 



Pressure (SI) 

3kPa 
15 kPa 
20 kPa 
70 kPa 
101 kPa 
100 kPa 
200 kPa 
350 kPa 
700 kPa 
IMPa 
1.5 MPa 
1.7 MPa 

2 MPa 
2.5 MPa 

3 MPa 
3.5 MPa 

4 MPa 
8 MPa 
10 MPa 



(k) Material properties that are expressed in psi or ksi 
(e.g., allowable stress, yield and tensile strength, elastic 
modulus) were generally converted to MPa to three sig- 
nificant figures. See example in the following table: 



Strength (U.S. Customary) 
95,000 psi 



Strength (SI) 
655 MPa 



(I) In most cases, temperatures (e.g., for PWHT) were 
rounded to the nearest 5°C. Depending on the implied 
precision of the temperature, some were rounded to the 
nearest 1°C or 10°C or even 25°C. Temperatures colder 
than 0°F (negative values) were generally rounded to 
the nearest 1°C The examples in the following table 
were created by rounding to the nearest 5°C, with one 
exception: 



45 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



Temperature, °F 


Temperature, °C 


70 


20 


100 


38 


120 


50 


150 


65 


200 


95 


250 


120 


300 


150 


350 


175 


400 


205 


450 


230 


500 


260 


550 


290 


600 


315 


650 


345 


700 


370 


750 


400 


800 


425 


850 


455 


900 


480 


925 


495 


950 


510 


1,000 


540 


1,050 


565 


1,100 


595 


1,150 


620 


1,200 


650 


1,250 


675 


1,800 


980 


1,900 


1040 


2,000 


1095 


2,050 


1 120 



value by the factor given to obtain the SI value. Similarly, 
divide the SI value by the factor given to obtain the U.S. 
Customary value. In most cases, it is appropriate to 
round the answer to three significant figures. 



F-3 SOFT CONVERSION FACTORS 

The following table of "soft" conversion factors is 
provided for convenience. Multiply the U.S. Customary 



U.S. 










Customary 


SI 


Factor 


Notes 


in. 


mm 


25.4 






ft 


m 


0.3048 






in. 2 


mm 2 


645.16 






ft 2 


m 2 


0.09290304 






in. 3 


mm 3 


16,387.064 






ft 3 


m 3 


0.02831685 






U.S. gal 


m 3 


0,003785412 






U.S. gal 


liters 


3.785412 






psi 


MPa 


0.0068948 


Used exclusively in 




(N/mm 


2 ) 


equations 


psi 


kPa 


6.894757 


Used only in text and 
for nam epl ate 


in. WC 


kPa 


0.249089 




psi 


bar 


0.06894757 




ft-lb 


J 


1.355818 




°F 


°C 


% x (°F - 32) 


Not for temperature 
difference 


°F 


°C 


5 / 

'9 


For temperature 
differences only 


R 


K 


7 9 


Absolute temperature 


lbm 


kg 


0.4535924 




lbf 


N 


4.448222 




in.-lb 


N-rnm 


112.98484 


Use exclusively in 
equations 


ft-lb 


N-m 


1.3558181 


Use only in text 


Btu/hr 


W 


0.29230711 


Use for boiler rating 
and heat transfer 


lb/ft 3 


kg/m 3 


16.018463 







46 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1-2009 



INDEX 



(09) 



Annunciator systems, CG-250 
Atmospheric vent, gas, CF-190 
Automatic ignition devices, CF-320, CF-520 
Automatic ignition system, CE-140 



Maintenance, CG-430, CM-100 
Material requirements, CG-300 
Modular boilers, CW-600, CF-900 
Motors, CE-130 



Bleed, gas, CF-190 

Bonding and grounding, CE-160 

Burner assemblies, CF-110, CF-410, CF-710 

Burner, gas-fired, CF-110 

Burner, oil-fired, CF-410 



Certification and reporting, CG-510 
Cleaning, CG-410 

Combination units, gas- and oil-fired, CF-710 
Combustion air, CG-260, CF-480 
Combustion air control, CF-220 
Combustion air proving, CF-480 
Components, CG-310 
Definitions, CG-700 



Observation ports, CG-230 
Operational testing, CG-440 
Overcurrent protection, CE-120 
Overpressure protection, gas, CF-161 

Periodic testing and maintenance, CM-100, CM-130 
Periodic testing checklist, Table D-l 
Preignition purging, CF-210, CF-470 
Pressure controls, steam, CW-310, CW-620 
Pressure regulator, gas, CF-160 
Pressure switches, fuel, CF-162, CF-450 
Preventive maintenance schedule, Appendix D 
Primary safety control, CF-310, CF-510 
Purging, CF-200, CF-470 



Electrical requirements, CE-100 
Electrically heated boilers, CF-810, CF-930 
Exclusions, CG-130 

Filter, gas, CF-130 

Filter, oil, CF-430 

Flame failure, CF-330, CF-530 

Forced circulation boilers 
flow sensing device, CW-210 
temperature sensing device, CW-210 

Fuel train, CF-120, CF-420, Appendix B 



Relief line, gas, CF-190 

Scope, CG-110 
Sediment trap, CF-140 
Service limitations, CG-120 
Strainer, CF-130, CF-430 



Temperature controls, hot-water, CW-410, CW-640 
Temperature switch, oil, CF-450 
Testing, CG-420, CM-100 



Gas- and oil-fired combination units, CF-700 
General provisions, CG-210 
Guarding, CG-240 

Hot-water supply boilers, CW-520 

Ignition devices (see automatic ignition devices) 
Ignition system, CE-140 
Installations, CG-220 

Lockout, operation, CG-610 
Low fire start, gas /oil, CF-610 
Low water fuel cutoff device (see water level control 
devices) 



Valve, control, CF-170 

Valve, gas shutoff, manually operated, CF-150 

Valve, oil relief, CF-440 

Valve, safety and safety relief, CW-500 

Valve, safety shutoff, CF-180, CF-460 

Vent, gas, CF-190 

Vent limiter, CF-160, CF-190 

Water feeding device, CW-100 

Water level control devices, hot- water, CW-110, 

CW-130, CW-140, CW-150, CW-630 
Water level control devices, steam, CW-110, CW-120, 

CW-140, CW-150, CW-610 
Wiring, CE-150 



47 



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INTENTIONALLY LEFT BLANK 



48 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1 INTERPRETATIONS 



ASME CSD-1 
INTERPRETATIONS VOLUME 14 

Replies to Technical Inquiries 
June 2008 Through September 2008 

FOREWORD 

This publication includes written replies issued in the year indicated by the secretary, speaking 
for the ASME CSDAFB Committee, to inquiries concerning interpretations of technical aspects 
of ASME CSD-1. 

These replies are taken verbatim from the original replies except for a few typographical 
corrections and some minor editorial corrections made for the purpose of improved clarity. In 
some few instances, a review of the interpretation may reveal a need for corrections of a technical 
nature; in these cases, a corrected interpretation will immediately follow the original reply 

These interpretations were prepared in accordance with the accredited ASME procedures. 
ASME procedures provide for reconsideration of these interpretations when or if additional 
information is available that the inquirer believes might affect the interpretation. Further, persons 
aggrieved by this interpretation may appeal to the cognizant ASME committee or subcommittee. 
ASME does not "approve," "certify," "rate," or "endorse" any item, construction, proprietary 
device, or activity. 



1-1 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1 INTERPRETATIONS 



Interpretation: 09-01 

Subject: CSD-1-2006, para. CF-120(a) 
Date Issued: June 11, 2008 

Question: Does para. CF-120(a) recommending fuel train design (specifically, Fig. B-3) supersede 
para. CF-1 62(c) indicating the location of the low gas-pressure switch? 

Reply: No. 



Interpretation: 09-02 

Subject: CSD-1-2006, para. CF-162(d) 
Date Issued: July 9, 2008 

Question: Does a high gas-pressure switch located on the manifold between the blower and 
burner meet the intent of para. CF-1 62(c)? 

Reply: No. 



Interpretation: 09-03 

Subject: CSD-1-2006, Exclusions 
Date Issued: September 26, 2008 

Question (1): Are low-pressure steam boilers constructed to ASME Boiler and Pressure Vessel 
Code, Section IV that typically supply steam for ovens and unfired stream-jacked kettles used 
in the preparation of food within the scope of CSD-1-2006? 

Reply (1): Yes. 

Question (2): Are electrically heated or gas-fired jacketed steam kettles constructed to ASME 
Boiler and Pressure Vessel Code, Section VIII, Division 1 that comply with Mandatory Appendix 
19 within the scope of CSD-1-2006? 

Reply (2): No (see definition of boiler). 



1-2 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1 INTERPRETATIONS 



NUMERICAL AND SUBJECT INDEX 



Inquiry No. 


Date 


Subject 


Edition 


Reference 


Vol. 


88-1 


6/28/88 


Gas train 


1982 




CF-180, Fig. CF-1 




88-2 


4/5/89 


Periodic testing 


All 




CM1 


1 


89-1 


9/20/89 


Modular boilers 


1988 




CW-120, CR 


2 


89-2 


9/20/89 


Safety shutdown 


1984 




CF-220, Table CF-1 


2 


89-3 


9/20/89 


Safety shutdown 


1984 




CW-120, CR 


2 


89-4 


4/5/90 


Safety shutdown 


1988 




CW-210, CW-llO(e) 


2 


89-5 


4/5/90 


Testing 


1988 




CG-500, CG-420 


2 


90-1 


2/12/90 


Effective date 


Any 




Issue date, Appendix A 


2 


90-2 


4/5/90 


Rebuilt controls 


1988 




CF-310 


2 


90-3 


4/5/90 


Relief valve 


1988 




CW-520, Appendix A 


2 


90-4 


10/12/90 


Lockout 


1988, 1989 




CF-330, CF-530, Definitions 


3 


90-5 


10/12/90 


Vents 


1988, 1989 




CF-190 


3 


91-1 


4/15/91 


Flame failure 


1988 




Table CF-2 


3 


91-2 


4/15/91 


Combustion air prov. 


1988, 1989, 


1990 


Tables CF-1, CF-2, CF-3 


3 


91-3 


4/15/91 


Hot water low-water cutoff 


1988, 1989, 


1990 


CW-130, CR-210 


3 


91-4 


4/15/91 


Safety shutoff valves 


1982, 1984 




CF-180, Table CF-1 


3 


91-5 


4/15/91 


Safety shutoff valves 


1988, 1989, 


1990 


CF-180 


3 


91-7 


11/15/91 


Pump motors 


1988, 1989, 


1990 


CE-130 


4 


91-8 


11/16/91 


Water level controls 


1988, 1989, 


1990 


CW-130 


4 


92-2 


5/15/92 


Scope, definitions 


All 






4 


93-1 


11/9/93 


Limit controls 


1988 




CW-210, CF-210 


4 


93-2 


11/9/93 


Rebuilt controls 


All 




See Inquiry 90-2 


4 


94-1 


2/14/94 


Purge 


1992, 1993 




CF-210 


4 


94-3 


5/25/94 


Pressure controls 


1992, 1993 




CW-310ff), CW-310(g) 


5 


94-4 


5/17/94 


Low-water cutoff 


1992, 1993 




CW-3lO(c) 


6 


94-4a 


5/31/94 


Z21.13 


1992, 1993 




CSD-1 


5 


94-5 


5/31/94 


Purge damper 


1992, 1993 




CF-200, Tables CF-1, CF-2 


5 


94-6 


5/31/94 


Burners 


1992, 1993 




CF-160 


5 


94-8 


9/2/94 


Low-water cutoff 


1992, 1993 




CW-120(b)(2) 


5 


94-9 


12/1/94 


Pressure controls 


1992, 1993 




CW-310 


5 


95-1 


2/10/94 


Electric boiler 


1992, 1993, 


1994 


CR-llO(f) 


5 


95-2 


11/22/95 


Lockout 


1992, 1993 




Definitions 


6 


95-4 


11/22/95 


Burners 


1992, 1993, 


1994 


CF-110(a) 


6 


96- la 


5/16/96 


Flow /temperature sensor 


1992, 1994 




CW-210 


7 


96-lb 


5/16/96 


Exclusions 


1992, 1994 




CG-130 


7 


96-2a 


5/16/96 


Exclusions 


1995 




CG-130 


7 


96-2b 


5/16/96 


Controls listing 


1995 




CW-310, CW-110, CW-410 


7 


96-03 


5/16/96 


Lockout 


1995 




CF-310, CF-510, CF-710 


7 


96-04 


11/19/96 


Leak test valves 


1995 




CF-150(d) 


8 


96-04R 


10/29/97 


Leak test valves 


1995 




CF-150(d) 


8 


96-05 


11/19/96 


Exclusions 


1995 




CG-130 


8 


97-01 


5/23/97 


Pressure controls 


1995, 1996 




CW-130 


8 


97-02 


5/23/97 


Electrical 


1995, 1996 




CE-llO(a) 


8 


97-03 


10/29/97 


Water level controls 


1995 




CW-140a 


9 


97-04 


11/25/97 


Water level controls 


1995 




CW-140(c) 


9 


97-05 


10/15/97 


Manifolding pressure ctrls. 


1995, 1996a 




CW-310(h) 


9 


97-06 


10/29/97 


Atmospheric gas boiler 


1995, 1996a 


, 1996b 


CG-100(a)(l) 


9 


97-07 


10/29/97 


Atmospheric vents 


1995, 1996a 


, 1996b 


CF-190 


9 


97-08 


10/29/97 


Atmospheric type burner 


1995, 1996a 


, 1996b 


Definitions 


9 


97-09 


10/29/97 


Automatic ignition devices 


1995 




CF-320 


9 


97-10 


10/29/97 


Safety shutoff valves 


1995 




CF-180 


9 


97-11 


1/6/98 


Low-water cutoff 1995 

(a) 




CW-120, CW-140 


9 




( Copyright © 2009 by the American Society of Mechanical Engineers 








I No reproduction may be made of this material without written consent of ASME. ^(§£dj 





ASME CSD-1 INTERPRETATIONS 



Inquiry No. 



Date 



Subject 



Edition 




Reference 


Vol 


1995 




CF-150(a) 


9 


1995, 1996a, 


1996b 


CW-140(d) 


9 


1995, 1996a, 


1996b 


CW-140(d) 


9 


1995, 1996a, 


1996b 


CF-150(a) 


9 


1995 




CF-190 


9 


1995, 1996a, 


1996b 


CF-160 


9 


1998 




CF-320 


9 


1998 




CW-310(j) 


10 


1998 




CF-320 


9 


1995, 1996 




CW-150 


10 


1998 




CM-110, CM-120, CM-130, 
Table CM-1 


10 


1998 




CG-260 


10 


1998 




CF-150(b) 


10 


1995-1998 




CG-130 


10 


1998 




CW-130(d) 


10 


1998 




CF-162 


10 


1998 




CF-100(b) 


10 


1998 




CF-320(b), CF-310, CF-330 


10 


1998 




CF-190(e) 


10 


1998 




Table CM-1 


10 


1998 




CF-310, CF-510 


10 


1998 




Table CF-1 


10 


1998 




CW-140 


10 


1998 




CW-210 


10 


1998 




CF-220, Table CF-1 


10 


1998, 1999a 




CW-310(a), CW-410(a) 


11 


1998, 1999a 




CW-410(c) 


12 


1998, 1999a 




CW-210 


12 


1998, 1999a, 


2001b 


CF-150(b) 


12 


1998, 1999a, 


2001b 


CF-300, Tables CF-1 
through CF-5 


12 


2002 




CG-110 


12 


2002 




CG-110, CF-110 


12 


2002 




CF-150(d) 


12 


1998 




CG-110(a)(l), Parts CM 
and CF 


13 


2002 




CF-161 


13 


2002 




CF-162 


13 


1998, 1999a, 




CW-120, CW-130, CW-140, 


13 


1999b, 2002 


CW-150 




2002 




CE-llO(a) 


13 


2002 




CW-120 


13 


2002 




CE-llO(a) 


13 



98-01 3/9/98 Gas shutoff valve 

98-02 6/10/98 Water level controls 

98-03 6/10/98 Water level controls 

98-04 8/10/98 Gas shutoff valve 

98-05 9/15/98 Atmospheric vents 

98-06 9/15/98 Gas-pressure regulator 

98-07 12/31/98 Automatic ignition device 

98-08 11/29/99 Pressure controls for steam 

98-09 3/31/99 Automatic ignition device 

98-10 6/16/99 Operating and safety controls 

98-11 5/21/99 Testing of controls 

99-01 6/16/99 Combustion air 

99-02 6/16/99 Manually operated gas shutoff valve 

99-03 6/16/99 Exclusions 

99-04 11/29/99 Low-water cutoff 

99-05 9/17/99 Gas-pressure switch 

99-07 11/29/99 Gas-fired boiler units 

99-08 7/18/00 Burners 

00-01A 7/10/00 Vents 

00-01B 7/18/00 Testing 

00-02 7/18/00 Primary safety control 

00-03 7/18/00 Fuel pressure supervision 

00-04 7/18/00 Low-water cutoff 

00-07 12/14/00 Testing of flow switches 

00-08 12/14/00 Combustion air proving 

01-01 6/15/01 Pressure controls 

01-02 10/17/01 Temperature controls 

02-01 5/9/02 Gas-pressure switches 

02-02 5/9/02 Pilot gas supply 

02-03 5/9/02 Pulse combustion process 

02-04 10/15/02 Fuel 

02-05 5/14/04 Fuel 

03-01 04/10/03 Downstream manual shutoff valve 

03-03 05/14/04 Compliance with Parts CM and CF 

04-01 05/14/04 Overpressure protection 

04-02 05/14/04 Pressure switches 

04-03 11/30/05 Shutdown valves 

04-04 02/02/05 Emergency switch and electric 

boilers 

05-01 02/11/05 Water level controls for low-pres- 
sure steam vapor system boilers 

05-02 11/30/05 Emergency switch and electric 

boilers 



(b) 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



ASME CSD-1 INTERPRETATIONS 



Inquiry No. 


Date 


Subject 


Edition 


1 


Reference Vol. 


05-03 


11/30/05 


Location of high limit 


1998 


CW-410 


13 


05-04 


08/08/06 


Locking device 


2002 


CE-llO(a) 


13 


06-01 


08/08/06 


Shutdown switch 


2004 


CE-1 10(a) 


and (d) 13 


09-01 


06/11/08 


Fuel train design 


2006 


CF-120(a) 


1.4 


09-02 


07/09/08 


High gas-pressure switch 


2006 


CF-162(d) 


14 


09-03 


09/26/08 


Jacketed steam kettles 


2006 


Exclusions 14 


This list of in 


terpretations 


refers to the following 


CSD-1 editions: 






First edition 




Issued April 29, 1977 


Fifth edition 




Issued June 30, 1995 


Second edition 




Issued December 31, 1982 


la addenda 




Issued July 31, 1996 


la addenda 




Issued November 15, 1984 


lb addenda 




Issued December 20, 1996 


Third edition 




Issued February 15, 1989 


Sixth edition 




Issued April 14, 1998 


la addenda 




Issued February 15, 1990 


la addenda 




Issued March 10, 2000 


lb addenda 




Issued December 1, 1990 


lb addenda 




Issued November 30, 2001 


Fourth edition 




Issued June 15, 1992 


Seventh edition 




Issued April 15, 2002 


la addenda 




Issued November 30, 1993 


Eighth edition 




Issued April 15, 2005 


lb addenda 




Issued September 30, 1994 


Ninth edition 
Tenth edition 




Issued December 29, 2006 
Issued May 8, 2009 



There were no inquiries prior to 1988. 



(c) 



Copyright © 2009 by the American Society of Mechanical Engineers. 
No reproduction may be made of this material without written consent of ASME. 



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A09109 



Copyright © 2009 by the American Society of Mechanical Engineers. 
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